Replacing the main power supply filter caps today. The main reason
is I have two units and the first unit was dead silent from hiss or hum.
The second unit has always had slight hum noticeable at 6" from speaker.
The Elna caps are from an old JVC that crapped out several years
ago from bad transistors and improper heat sinking. . .even the
pros screw up once in a while.
Charged and discharged Elnas via resistors and LEDs and both
discharged about the same rate. . .should still have a few years
of life left in them. Tracon are Korean. . .not bad in itself but the
sound hollow. Will test Tracon with same circuit and see. . .will
probably open them up and check to see if they are the really
cheap units that have a small cap inside a larger shell. . .
Old Caps: Tracon 6800mF / 50V 105 C
New Caps: Elna 6800 mF / 71V 85 C
Same diameter but Tracons are about a 3/8" shorter; The cap
height is only at the metal heat sink height. Only worried about
85 C temp rating (185 Fahrenheit) instead of the 105 C (221 Fahrenheit).
I don't really think the amplifier will every get 185 F before self-destruction though. Since the Elna are 71V they should
handle the regular voltage with headroom to spare. . .they should
never self-overheat in this amp. I've run the amp hard on several
occasions and the heat sink can get quite hot but never enough
to heat the caps. . . the unit will be installed in a larger case after
the new caps are done. . .will upload pics. . .making an MP3 boom
box with some old JVC boom box speakers. . .
is I have two units and the first unit was dead silent from hiss or hum.
The second unit has always had slight hum noticeable at 6" from speaker.
The Elna caps are from an old JVC that crapped out several years
ago from bad transistors and improper heat sinking. . .even the
pros screw up once in a while.
Charged and discharged Elnas via resistors and LEDs and both
discharged about the same rate. . .should still have a few years
of life left in them. Tracon are Korean. . .not bad in itself but the
sound hollow. Will test Tracon with same circuit and see. . .will
probably open them up and check to see if they are the really
cheap units that have a small cap inside a larger shell. . .
Old Caps: Tracon 6800mF / 50V 105 C
New Caps: Elna 6800 mF / 71V 85 C
Same diameter but Tracons are about a 3/8" shorter; The cap
height is only at the metal heat sink height. Only worried about
85 C temp rating (185 Fahrenheit) instead of the 105 C (221 Fahrenheit).
I don't really think the amplifier will every get 185 F before self-destruction though. Since the Elna are 71V they should
handle the regular voltage with headroom to spare. . .they should
never self-overheat in this amp. I've run the amp hard on several
occasions and the heat sink can get quite hot but never enough
to heat the caps. . . the unit will be installed in a larger case after
the new caps are done. . .will upload pics. . .making an MP3 boom
box with some old JVC boom box speakers. . .
spudfrog said:I dusted one of these off for a project I'm working on and I have an issue trying to bypass the preamp. One channel seems to work fine, will the other cuts in with the volume about 2/3 or the way up.
Any thoughts?
I would check with a multimeter to see if the pot tracks the two channels on the volume control ok...
New power supply caps installed. . .didn't change
the hum. . .now I think it might be 120Hz and not 60Hz. . .
can't really install more capacitance. . .just minor design
flaw in the amp itself. About 3" you can hear the hum. . .
depends on sensitivity of speaker. . .
the hum. . .now I think it might be 120Hz and not 60Hz. . .
can't really install more capacitance. . .just minor design
flaw in the amp itself. About 3" you can hear the hum. . .
depends on sensitivity of speaker. . .
The transformer is:
LS-A10767-PT-T Rev B
INPUT: 120VAC 60Hz (BRN-BLK)
OUTPUT: 28.7V-0-28.7V 2A (BLU-WHT-BLU)
No VA rating was given.
PARTS EXPRESS TRANSFORMERS
Avel Y236503 160VA 22V+22V Toroidal Transformer $41.60
Avel Y236652 250VA 25V+25V Toroidal Transformer $46.10
Avel Y236653 250VA 30V+30V Toroidal Transformer $46.10
Still a great deal for the transformer alone!
LS-A10767-PT-T Rev B
INPUT: 120VAC 60Hz (BRN-BLK)
OUTPUT: 28.7V-0-28.7V 2A (BLU-WHT-BLU)
No VA rating was given.
PARTS EXPRESS TRANSFORMERS
Avel Y236503 160VA 22V+22V Toroidal Transformer $41.60
Avel Y236652 250VA 25V+25V Toroidal Transformer $46.10
Avel Y236653 250VA 30V+30V Toroidal Transformer $46.10
Still a great deal for the transformer alone!
BACK IN STOCK
These units are back in stock!
I guess Radio shack just has warehouses full of these things.
Still $14.97 in Sonoma County (1 hour north of San Francisco).
Built one into a boom box by placing it between two older
speakers from an old boom box. . .will upload soon. . . very
good work I might say. . .
These units are back in stock!
I guess Radio shack just has warehouses full of these things.
Still $14.97 in Sonoma County (1 hour north of San Francisco).
Built one into a boom box by placing it between two older
speakers from an old boom box. . .will upload soon. . . very
good work I might say. . .
I've been wishing for more of these since last year . I bought 3.
I don't find these on the shack web site though .
got a Part Number ?
Were these in store manager specials only ,
or do ya think I can get that free shipping to my local shack ?
Did you see the speaker/amps ?
Wayne
I don't find these on the shack web site though .
got a Part Number ?
Were these in store manager specials only ,
or do ya think I can get that free shipping to my local shack ?
Did you see the speaker/amps ?
Wayne
Local RS just received 8 more Accurain Receivers! Employee stated that corporate
just keeps sending them. They are selling them as low power amplifiers and telling
customers that they only to connect a source to the RCAs labeled 'output'.
Still $14.97!
Great price for transformer alone!
just keeps sending them. They are selling them as low power amplifiers and telling
customers that they only to connect a source to the RCAs labeled 'output'.
Still $14.97!
Great price for transformer alone!
I went to various RS nearby , I asked them to check other stores
and none had any listing on these .
Maybe they use a different number these days ?
15-1937 ( AMP )
40-1462 ( Spkrs w/Amp )
I see 5 Santa Rosa stores..which one ?
I'd like to see if they can do the free ship to store ...my store .
Wayne
and none had any listing on these .
Maybe they use a different number these days ?
15-1937 ( AMP )
40-1462 ( Spkrs w/Amp )
I see 5 Santa Rosa stores..which one ?
I'd like to see if they can do the free ship to store ...my store .
Wayne
That is interesting. You could give them a call. They really must have a warehouse full of them.
Santa Rosa Radio Shacks
546-8423
527-9419
526-4571
546-7895
526-7620
Windsor
838-1648 (Had 8 shipped to them - I bought 2 more and two we left
on the floor. The rest are probably up above the shelves)
The are selling them a amps only -- just hook into the line out.
Some comments on the design. I measured no bias voltage across
R123, R124, R223, R224!!!!!
Here is the schematic for the right channel. Still working but should be close;
also an updated parts list
Accurian Amplifier
All Resistors are gold = 5%
All Resistors are 1/8W unless otherwise stated
Main Audio Board
R18 (Y,V,R,Gl) 4.7 kΩ LED Power Supply
Left,Right
1xx,2xx
Resistors
R100,200 (Gr,Br,Br,Gl) 510 Ω Input
R101,201 (Br,Bl,O,Gl) 10 kΩ Input {0.20 mV R101 : 5.8mV R201}
R103,203 (Br,Bl,R,Gl) 1.0 kΩ {828mV : 835mV}
R104,204 (Br,Bl,R,Gl) 1.0 kΩ {836mV : 830mV}
R105,205 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.7mV}
R106,206 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.6mV}
R107,207 (Br,Bl,Br,Gl) 100 Ω {90.4mV : 87.7mV}
R108,208 (Br,Bl,Br,Gl) 100 Ω {85.5mV : 86.6mV}
R109,209 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.99V}
R110,210 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.80V}
R111,211 (Y,V,Bl,Gl) 47 Ω {41.8mV : 40.8mV}
R112,212 (Y,V,Bl,Gl) 47 Ω {39.7mV : 40.1mV}
R113,213 (Gr,Bu,R,Gl) 5.6 kΩ {2.9mV : 3.3mV} [Local Feedback?]
R114,214 (Br,Bl,R,Gl) 1.0 kΩ
R115,215 (Y,V,Bl,Gl) 47 Ω {220.2mV}
R116,216 (Y,V,Bl,Gl) 47 Ω {231.6mV : 226.4mV}
R117,217 (Y,V,R,Gl) 4.7 kΩ {1.25V : 1.25V}
R118,218 (R,V,R,Gl) 2.7 kΩ {670mV : 672mV}
R119,219 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R120,220 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R121,221 (O,O,Br,Gl) 330 Ω [1W] {796mV : 798mV}
R122,222 (Y,V,Gl,Gl) 4.7 Ω [1W] Zobel
R123,223 (R,R,S,Gl) 0.22 Ω [2W] Output
R124,224 (R,R,S,Gl) 0.22 Ω [2W] Output
R125,225 (O,O,R,Gl) 3.3 kΩ
R126,226 (Br,Bl,O,Gl) 10 kΩ [Possible Feedback]
R127,227 (Y,V,O,Gl) 47 kΩ
Caps
C101,201 10 µF,25V Electro
C102,202 2n7J 100 Yellow Rectangle [2.7nF? 5%]
C103,203 470J 50V Silver [47pF? 5%]
C104,204 220 µF,25V Electro
C105,205 47 Disc [47pF]
C106.206 47 Disc [47pF]
C107,207 blue
C108,208 blue
C109,209 473J 1H-P Silver Rectangle [47nF? 5%]
C110,210 100nJ 100 [Yellow Rectangle Zobel 100nF? 5%]
C111,211 1.0 µF,50V Electro
Diodes
D101,201
Transistors
Q101,201 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q102,202 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q103,203 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q104,204 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q105,205 C3198 [NPN Epitaxial Silicon (TO-92)]
Q106,206 A1266 [PNP Epitaxial Planar Low Noise (TO-92)] INPUT
Q107,207 C1027 [NPN Epitaxial Silicon (TO-92L)]
Q108,208 A1023 [PNP Epitaxial Silicon (TO-92L)]
Q109,209 TIP41C [NPN Epitaxial Planar (TO-220)] Power
Q110,210 TIP42C [PNP Epitaxial Planar (TO-220)]Power
Q111,211 Heatsink (bias?)
Q112,212 C1815 [NPN Silicon Transistor (TO-92)]
Q7 Output Relay Control
PreBoard
[milli, micro, nano,pico]
C501,502 4.7microF,50V Electro
C502,504 blue
C505,506 1microF,50V Electro
C507,508 47 Disc [47pF]
C509,510 4.7microF,50V Electro
C511,512 152J Silver Rectangle, Treble [1.5 nF 5%]
C513,514 330J Silver Rectangle, Bass [33 pF 5%]
C515,516 330J Silver Rectangle, Bass
C517,518 47 Disc [47pF]
C519,520 103J Silver Rectangle [10 nF 5%]
C521,522 682K Disc [6.8 nF 10%]
C523,524 4.7microF,50V Electro
R501,502 (R,R,O,G) 22k input
R503,504 (Br,R,O,G) 12k input
R505,506 (W,Br,O,G) 91k opamp
R507,508 (Br,Gy,R,G) 1.8k Treble
R509,510 (Br,Gy,R,G) 1.8k
R511,512 (Br,Gy,O,G) 18k
R513,514 (Br,Gy,O,G) 18k
R515,516 (O,W,R,G) 3.9k
R517,518 (Br,Bl,R,G) 1.0k
R519,520 (Y,V,O,G) 47k
R521,522 (Br,Gr,Y,G) 150k
R523,524 (R,Bl,O,G) 20k
U501 4558D JRC 3265G
U502
VR1 100k Volume Stereo
VR2 100k Balance Mono
VR3 50k Bass Stereo
VR4 50k Treble Stereo
Santa Rosa Radio Shacks
546-8423
527-9419
526-4571
546-7895
526-7620
Windsor
838-1648 (Had 8 shipped to them - I bought 2 more and two we left
on the floor. The rest are probably up above the shelves)
The are selling them a amps only -- just hook into the line out.
Some comments on the design. I measured no bias voltage across
R123, R124, R223, R224!!!!!
Here is the schematic for the right channel. Still working but should be close;
also an updated parts list
Accurian Amplifier
All Resistors are gold = 5%
All Resistors are 1/8W unless otherwise stated
Main Audio Board
R18 (Y,V,R,Gl) 4.7 kΩ LED Power Supply
Left,Right
1xx,2xx
Resistors
R100,200 (Gr,Br,Br,Gl) 510 Ω Input
R101,201 (Br,Bl,O,Gl) 10 kΩ Input {0.20 mV R101 : 5.8mV R201}
R103,203 (Br,Bl,R,Gl) 1.0 kΩ {828mV : 835mV}
R104,204 (Br,Bl,R,Gl) 1.0 kΩ {836mV : 830mV}
R105,205 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.7mV}
R106,206 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.6mV}
R107,207 (Br,Bl,Br,Gl) 100 Ω {90.4mV : 87.7mV}
R108,208 (Br,Bl,Br,Gl) 100 Ω {85.5mV : 86.6mV}
R109,209 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.99V}
R110,210 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.80V}
R111,211 (Y,V,Bl,Gl) 47 Ω {41.8mV : 40.8mV}
R112,212 (Y,V,Bl,Gl) 47 Ω {39.7mV : 40.1mV}
R113,213 (Gr,Bu,R,Gl) 5.6 kΩ {2.9mV : 3.3mV} [Local Feedback?]
R114,214 (Br,Bl,R,Gl) 1.0 kΩ
R115,215 (Y,V,Bl,Gl) 47 Ω {220.2mV}
R116,216 (Y,V,Bl,Gl) 47 Ω {231.6mV : 226.4mV}
R117,217 (Y,V,R,Gl) 4.7 kΩ {1.25V : 1.25V}
R118,218 (R,V,R,Gl) 2.7 kΩ {670mV : 672mV}
R119,219 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R120,220 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R121,221 (O,O,Br,Gl) 330 Ω [1W] {796mV : 798mV}
R122,222 (Y,V,Gl,Gl) 4.7 Ω [1W] Zobel
R123,223 (R,R,S,Gl) 0.22 Ω [2W] Output
R124,224 (R,R,S,Gl) 0.22 Ω [2W] Output
R125,225 (O,O,R,Gl) 3.3 kΩ
R126,226 (Br,Bl,O,Gl) 10 kΩ [Possible Feedback]
R127,227 (Y,V,O,Gl) 47 kΩ
Caps
C101,201 10 µF,25V Electro
C102,202 2n7J 100 Yellow Rectangle [2.7nF? 5%]
C103,203 470J 50V Silver [47pF? 5%]
C104,204 220 µF,25V Electro
C105,205 47 Disc [47pF]
C106.206 47 Disc [47pF]
C107,207 blue
C108,208 blue
C109,209 473J 1H-P Silver Rectangle [47nF? 5%]
C110,210 100nJ 100 [Yellow Rectangle Zobel 100nF? 5%]
C111,211 1.0 µF,50V Electro
Diodes
D101,201
Transistors
Q101,201 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q102,202 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q103,203 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q104,204 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q105,205 C3198 [NPN Epitaxial Silicon (TO-92)]
Q106,206 A1266 [PNP Epitaxial Planar Low Noise (TO-92)] INPUT
Q107,207 C1027 [NPN Epitaxial Silicon (TO-92L)]
Q108,208 A1023 [PNP Epitaxial Silicon (TO-92L)]
Q109,209 TIP41C [NPN Epitaxial Planar (TO-220)] Power
Q110,210 TIP42C [PNP Epitaxial Planar (TO-220)]Power
Q111,211 Heatsink (bias?)
Q112,212 C1815 [NPN Silicon Transistor (TO-92)]
Q7 Output Relay Control
PreBoard
[milli, micro, nano,pico]
C501,502 4.7microF,50V Electro
C502,504 blue
C505,506 1microF,50V Electro
C507,508 47 Disc [47pF]
C509,510 4.7microF,50V Electro
C511,512 152J Silver Rectangle, Treble [1.5 nF 5%]
C513,514 330J Silver Rectangle, Bass [33 pF 5%]
C515,516 330J Silver Rectangle, Bass
C517,518 47 Disc [47pF]
C519,520 103J Silver Rectangle [10 nF 5%]
C521,522 682K Disc [6.8 nF 10%]
C523,524 4.7microF,50V Electro
R501,502 (R,R,O,G) 22k input
R503,504 (Br,R,O,G) 12k input
R505,506 (W,Br,O,G) 91k opamp
R507,508 (Br,Gy,R,G) 1.8k Treble
R509,510 (Br,Gy,R,G) 1.8k
R511,512 (Br,Gy,O,G) 18k
R513,514 (Br,Gy,O,G) 18k
R515,516 (O,W,R,G) 3.9k
R517,518 (Br,Bl,R,G) 1.0k
R519,520 (Y,V,O,G) 47k
R521,522 (Br,Gr,Y,G) 150k
R523,524 (R,Bl,O,G) 20k
U501 4558D JRC 3265G
U502
VR1 100k Volume Stereo
VR2 100k Balance Mono
VR3 50k Bass Stereo
VR4 50k Treble Stereo
Attachments
Thanks GNI! That post helps me a lot! I've had this thing for about a year now and am still happy with it. It's far from perfect, but the best $15 I ever spent.
Does anybody know how to get these ???
The local RS has no idea whatsoever, and the online catalog does NOT show the receiver - would anyone be willing to pick one up for me and ship it ? I can pay using PayPal or USPS money order...
The local RS has no idea whatsoever, and the online catalog does NOT show the receiver - would anyone be willing to pick one up for me and ship it ? I can pay using PayPal or USPS money order...
You just have to go to to radio shack and check.
The local sales guy said "they" just keep sending them to us.
The problem is shipping. Close to $15 shipping. About $35
total.
The local sales guy said "they" just keep sending them to us.
The problem is shipping. Close to $15 shipping. About $35
total.
Accurian Amplifier
Parts List Update
Schmatic Update
Accurian Amplifier
All Resistors are gold = 5%
All Resistors are 1/8W unless otherwise stated
Main Audio Board
R18 (Y,V,R,Gl) 4.7 kΩ LED Power Supply
Left,Right
1xx,2xx
Resistors
R100,200 (Gr,Br,Br,Gl) 510 Ω Input
R101,201 (Br,Bl,O,Gl) 10 kΩ Input {0.20 mV R101 : 5.8mV R201}
R103,203 (Br,Bl,R,Gl) 1.0 kΩ {828mV : 835mV}
R104,204 (Br,Bl,R,Gl) 1.0 kΩ {836mV : 830mV}
R105,205 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.7mV}
R106,206 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.6mV}
R107,207 (Br,Bl,Br,Gl) 100 Ω {90.4mV : 87.7mV}
R108,208 (Br,Bl,Br,Gl) 100 Ω {85.5mV : 86.6mV}
R109,209 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.99V}
R110,210 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.80V}
R111,211 (Y,V,Bl,Gl) 47 Ω {41.8mV : 40.8mV}
R112,212 (Y,V,Bl,Gl) 47 Ω {39.7mV : 40.1mV}
R113,213 (Gr,Bu,R,Gl) 5.6 kΩ {2.9mV : 3.3mV} [NFB]
R114,214 (Br,Bl,R,Gl) 1.0 kΩ [NFB]
R115,215 (Y,V,Bl,Gl) 47 Ω {220.2mV}
R116,216 (Y,V,Bl,Gl) 47 Ω {231.6mV : 226.4mV}
R117,217 (Y,V,R,Gl) 4.7 kΩ {1.25V : 1.25V}
R118,218 (R,V,R,Gl) 2.7 kΩ {670mV : 672mV}
R119,219 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R120,220 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R121,221 (O,O,Br,Gl) 330 Ω [1W] {796mV : 798mV}
R122,222 (Y,V,Gl,Gl) 4.7 Ω [1W] Zobel
R123,223 (R,R,S,Gl) 0.22 Ω [2W] Output
R124,224 (R,R,S,Gl) 0.22 Ω [2W] Output
R125,225 (O,O,R,Gl) 3.3 kΩ
R126,226 (Br,Bl,O,Gl) 10 kΩ
R127,227 (Y,V,O,Gl) 47 kΩ
Caps
C101,201 10 µF,25V Electro
C102,202 2n7J 100 Yellow Rectangle [2.7nF? 5%]
C103,203 470J 50V Silver [47pF? 5%]
C104,204 220 µF,25V Electro
C105,205 47 Disc [47pF]
C106.206 47 Disc [47pF]
C107,207 blue
C108,208 blue
C109,209 473J 1H-P Silver Rectangle [47nF? 5%]
C110,210 100nJ 100 [Yellow Rectangle Zobel 100nF? 5%]
C111,211 1.0 µF,50V Electro
Diodes
D101,201
Transistors
Q101,201 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q102,202 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q103,203 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q104,204 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q105,205 C3198 [NPN Epitaxial Silicon (TO-92)]
Q106,206 A1266 [PNP Epitaxial Planar Low Noise (TO-92)] INPUT
Q107,207 C1027 [NPN Epitaxial Silicon (TO-92L)]
Q108,208 A1023 [PNP Epitaxial Silicon (TO-92L)]
Q109,209 TIP41C [NPN Epitaxial Planar (TO-220)] Power
Q110,210 TIP42C [PNP Epitaxial Planar (TO-220)]Power
Q111,211 C945 [NPN (TO-92)] Heatsink
Q112,212 C1815 [NPN Silicon Transistor (TO-92)]
Q7 Output Relay Control
PreBoard
[milli, micro, nano,pico]
C501,502 4.7microF,50V Electro
C502,504 blue
C505,506 1microF,50V Electro
C507,508 47 Disc [47pF]
C509,510 4.7microF,50V Electro
C511,512 152J Silver Rectangle, Treble [1.5 nF 5%]
C513,514 330J Silver Rectangle, Bass [33 pF 5%]
C515,516 330J Silver Rectangle, Bass
C517,518 47 Disc [47pF]
C519,520 103J Silver Rectangle [10 nF 5%]
C521,522 682K Disc [6.8 nF 10%]
C523,524 4.7microF,50V Electro
R501,502 (R,R,O,G) 22k input
R503,504 (Br,R,O,G) 12k input
R505,506 (W,Br,O,G) 91k opamp
R507,508 (Br,Gy,R,G) 1.8k Treble
R509,510 (Br,Gy,R,G) 1.8k
R511,512 (Br,Gy,O,G) 18k
R513,514 (Br,Gy,O,G) 18k
R515,516 (O,W,R,G) 3.9k
R517,518 (Br,Bl,R,G) 1.0k
R519,520 (Y,V,O,G) 47k
R521,522 (Br,Gr,Y,G) 150k
R523,524 (R,Bl,O,G) 20k
U501 4558D JRC 3265G
U502
VR1 100k Volume Stereo
VR2 100k Balance Mono
VR3 50k Bass Stereo
VR4 50k Treble Stereo
Parts List Update
Schmatic Update
Accurian Amplifier
All Resistors are gold = 5%
All Resistors are 1/8W unless otherwise stated
Main Audio Board
R18 (Y,V,R,Gl) 4.7 kΩ LED Power Supply
Left,Right
1xx,2xx
Resistors
R100,200 (Gr,Br,Br,Gl) 510 Ω Input
R101,201 (Br,Bl,O,Gl) 10 kΩ Input {0.20 mV R101 : 5.8mV R201}
R103,203 (Br,Bl,R,Gl) 1.0 kΩ {828mV : 835mV}
R104,204 (Br,Bl,R,Gl) 1.0 kΩ {836mV : 830mV}
R105,205 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.7mV}
R106,206 (Br,Bl,Br,Gl) 100 Ω {83.9mV : 83.6mV}
R107,207 (Br,Bl,Br,Gl) 100 Ω {90.4mV : 87.7mV}
R108,208 (Br,Bl,Br,Gl) 100 Ω {85.5mV : 86.6mV}
R109,209 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.99V}
R110,210 (Gy,R,R,Gl) 8.2 kΩ [1/4W] {13.80V}
R111,211 (Y,V,Bl,Gl) 47 Ω {41.8mV : 40.8mV}
R112,212 (Y,V,Bl,Gl) 47 Ω {39.7mV : 40.1mV}
R113,213 (Gr,Bu,R,Gl) 5.6 kΩ {2.9mV : 3.3mV} [NFB]
R114,214 (Br,Bl,R,Gl) 1.0 kΩ [NFB]
R115,215 (Y,V,Bl,Gl) 47 Ω {220.2mV}
R116,216 (Y,V,Bl,Gl) 47 Ω {231.6mV : 226.4mV}
R117,217 (Y,V,R,Gl) 4.7 kΩ {1.25V : 1.25V}
R118,218 (R,V,R,Gl) 2.7 kΩ {670mV : 672mV}
R119,219 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R120,220 (R,R,Gl,Gl) 2.2 Ω [1/4W] to base
R121,221 (O,O,Br,Gl) 330 Ω [1W] {796mV : 798mV}
R122,222 (Y,V,Gl,Gl) 4.7 Ω [1W] Zobel
R123,223 (R,R,S,Gl) 0.22 Ω [2W] Output
R124,224 (R,R,S,Gl) 0.22 Ω [2W] Output
R125,225 (O,O,R,Gl) 3.3 kΩ
R126,226 (Br,Bl,O,Gl) 10 kΩ
R127,227 (Y,V,O,Gl) 47 kΩ
Caps
C101,201 10 µF,25V Electro
C102,202 2n7J 100 Yellow Rectangle [2.7nF? 5%]
C103,203 470J 50V Silver [47pF? 5%]
C104,204 220 µF,25V Electro
C105,205 47 Disc [47pF]
C106.206 47 Disc [47pF]
C107,207 blue
C108,208 blue
C109,209 473J 1H-P Silver Rectangle [47nF? 5%]
C110,210 100nJ 100 [Yellow Rectangle Zobel 100nF? 5%]
C111,211 1.0 µF,50V Electro
Diodes
D101,201
Transistors
Q101,201 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q102,202 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q103,203 C3198 [NPN Epitaxial Silicon (TO-92)] INPUT
Q104,204 A1266 [PNP Epitaxial Planar Low Noise (TO-92)]
Q105,205 C3198 [NPN Epitaxial Silicon (TO-92)]
Q106,206 A1266 [PNP Epitaxial Planar Low Noise (TO-92)] INPUT
Q107,207 C1027 [NPN Epitaxial Silicon (TO-92L)]
Q108,208 A1023 [PNP Epitaxial Silicon (TO-92L)]
Q109,209 TIP41C [NPN Epitaxial Planar (TO-220)] Power
Q110,210 TIP42C [PNP Epitaxial Planar (TO-220)]Power
Q111,211 C945 [NPN (TO-92)] Heatsink
Q112,212 C1815 [NPN Silicon Transistor (TO-92)]
Q7 Output Relay Control
PreBoard
[milli, micro, nano,pico]
C501,502 4.7microF,50V Electro
C502,504 blue
C505,506 1microF,50V Electro
C507,508 47 Disc [47pF]
C509,510 4.7microF,50V Electro
C511,512 152J Silver Rectangle, Treble [1.5 nF 5%]
C513,514 330J Silver Rectangle, Bass [33 pF 5%]
C515,516 330J Silver Rectangle, Bass
C517,518 47 Disc [47pF]
C519,520 103J Silver Rectangle [10 nF 5%]
C521,522 682K Disc [6.8 nF 10%]
C523,524 4.7microF,50V Electro
R501,502 (R,R,O,G) 22k input
R503,504 (Br,R,O,G) 12k input
R505,506 (W,Br,O,G) 91k opamp
R507,508 (Br,Gy,R,G) 1.8k Treble
R509,510 (Br,Gy,R,G) 1.8k
R511,512 (Br,Gy,O,G) 18k
R513,514 (Br,Gy,O,G) 18k
R515,516 (O,W,R,G) 3.9k
R517,518 (Br,Bl,R,G) 1.0k
R519,520 (Y,V,O,G) 47k
R521,522 (Br,Gr,Y,G) 150k
R523,524 (R,Bl,O,G) 20k
U501 4558D JRC 3265G
U502
VR1 100k Volume Stereo
VR2 100k Balance Mono
VR3 50k Bass Stereo
VR4 50k Treble Stereo
Attachments
Chris.... do you have the original Radio Shack schematic
This one seems strange to me.
Can you send me the original one?... this one you have posted was not made into the standard way...so it is confused to my old brain.... old fellow wants to see negative input in other side... VBE multiplier into the middle...drivers at output transistor left side...those things...input left..output rigth side..positive up and negative down..nothing under negative or upper positive and nothing after the output connector.
heheheheh
panzertoo@yahoo.com
regards,
Carlos
This one seems strange to me.
Can you send me the original one?... this one you have posted was not made into the standard way...so it is confused to my old brain.... old fellow wants to see negative input in other side... VBE multiplier into the middle...drivers at output transistor left side...those things...input left..output rigth side..positive up and negative down..nothing under negative or upper positive and nothing after the output connector.
heheheheh
panzertoo@yahoo.com
regards,
Carlos
Thank you for the great input!
I drew it from looking at the circuit board--there is no original that I have. My
goal was no crossing circuits. . . I will post the picture of the circuit. . .sorry about
the unconventional layout.
I drew it from looking at the circuit board--there is no original that I have. My
goal was no crossing circuits. . . I will post the picture of the circuit. . .sorry about
the unconventional layout.
I will have to email the PCB - 2MB with fine detail. . .
Very good drawing for sim.
My parts list has the correct parts. . . what about the extra transistors (Q207/208)
are they some sort of buffer?
Very good drawing for sim.
My parts list has the correct parts. . . what about the extra transistors (Q207/208)
are they some sort of buffer?
Re: Thank you by your efforts.
Looks like the base and emitter of the driver are reversed. Swap them, then it looks more normal.
Pete B.
destroyer X said:
Looks like the base and emitter of the driver are reversed. Swap them, then it looks more normal.
Pete B.
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