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Old 8th February 2012, 08:09 PM   #2241
Bensen is offline Bensen  Belgium
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Quote:
Originally Posted by pinnocchio View Post
Here's my little b24

Sounds really good!

Click the image to open in full size.

Fun to build but I should have taken a 400mm chassis instead of the 300mm. It was too tight!

Do
Wow, very nice build! I did a search after it, for me AMB is new.
Balanced amps are rare in the diy world, they intrique me.
Any change to send me the schematic with a PM?

Greetz
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Old 12th February 2012, 05:13 AM   #2242
Le7316 is offline Le7316  United States
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My first post here guys and here is mine,
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File Type: jpg IMG_0245.jpg (629.3 KB, 1122 views)
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Old 12th February 2012, 02:46 PM   #2243
fotios is offline fotios  Greece
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Default PGA2310 Line Preamplifier

This is my last preamplifier project. I simply started an experiment with the PGA2310 that finally led me in a complete project - as usually .
A summary of its properties:
1) It can be managed either locally thru 2 push switches and a rotary encoder, or remotely from a RC5 compatible universal remote control handset. Includes 5 Inputs, 1 Main Output and 1 Record Output. Control functions are the 7 basic: a)Power On/Stand By b) Mute c)Volume increment d)Volume decrement e)Balance f)Input selection in forward sequence and g)Input selection in backward sequence. All these functions are also supported by the remote control except the Balance.
2) The analog signal process is obtained thru a PGA2310 programmable volume control IC. Voltage gain can be adjusted from -95 up to +6dB in steps of 1dB. Volume control IC is buffered from input and output devices like CD players and Power amplifiers from four LME49710 operational amplifiers configured as voltage followers.
3) Separate power supplies are used for Analog and Digital section..
4) Input selection and Output Mute functions are obtained with the use of high quality Latching relays. The Stand By function (i.e. enable – disable the analog power supply transformer) is also obtained with a powerful SPNO/10A Latching relay. Latching type relays ensure both power saving and noise immunity on audio signal as their coils are inactive for most time. A momentary voltage pulse of 15ms is enough to change the location of their contacts.
5) The whole device is managed by a PIC16F887 microcontroller. The appropriate program code has obtained with the use of the powerful Visual Programming Software FlowCode v5 of Matrix Multimedia.
For a more detailed description, schematics and an offer to you my good friends (a free copy of code in hex format so you can program your PIC16F887 with any type programming device you own ) please here: Matrix Multimedia user forums • View topic - Hi-Fi audio preamplifier using Burr-Brown PGA2310
Here some pictures showing its functionality
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File Type: jpg PGA2310_1.jpg (157.9 KB, 1013 views)
File Type: jpg PGA2310_2.jpg (159.2 KB, 956 views)
File Type: jpg PGA2310_3.jpg (158.7 KB, 340 views)
File Type: jpg PGA2310_pre2a.jpg (226.5 KB, 387 views)
File Type: jpg PGA2310_pre3a.jpg (173.4 KB, 339 views)
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Last edited by fotios; 12th February 2012 at 02:54 PM.
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Old 12th February 2012, 03:14 PM   #2244
fotios is offline fotios  Greece
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Default PGA2310 Line Preamplifier - 2

Here is a general view of project, and a very - very interesting second picture. In the last you can see the performance of preamplifier. In this DSO screen shot it is obvious the rise time of signal at the output of preamplifier. After a pass thru 3 ICs: LME49710-->PGA2310-->LME49710 the square wave (for a total gain of 0dB) rise time has increased just to 200nsec! That means bandwidth: BW = 0.34 / 200nsec = 1.7MHz with negligible overshoot.
Fotis
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File Type: jpg PGA2310_5.jpg (98.9 KB, 274 views)
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Old 12th February 2012, 04:02 PM   #2245
Bonsai is offline Bonsai  Taiwan
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[QUOTE=sakis;2897527]Quad owners : You may hate my guts

Sorry but this was done on a costumer's request ...one way or another is reversible

happy regards
sakis

Jeez, now that looks terrible. An honorable audio fanatic would have declined!

;-)

LOL
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Old 12th February 2012, 07:54 PM   #2246
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Quote:
Originally Posted by Bensen View Post
Wow, very nice build! I did a search after it, for me AMB is new.
Balanced amps are rare in the diy world, they intrique me.
Any change to send me the schematic with a PM?

Greetz
Hi Bensen,

You can go on AMB's web site and send an email to Ti. Schematics are available on demand and I wouldn't want to send them without authorization.

I'm sure you'll get them without any issues. Ti is a great guy!

Ciao!
Do
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PREAMPs : AMB α10 + JC-80 clone | Balanced DCB1 | LDR3x | AMPs: AMB β24 | Aleph 5 | FirstOne | ML-2 | TSSA | Telos 390 Clone | My_Ref FE
DACs : TPA Buffalo II + OPC's NTD1 I/V | TPA OPUS + IVY III | Moon 380D DSD Speakers : Jim Holtz Statements | Astasia SD | Tubasson Mark 2
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Old 12th February 2012, 09:10 PM   #2247
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[QUOTE=Bonsai;2903426]
Quote:
Originally Posted by sakis View Post
Quad owners : You may hate my guts

Sorry but this was done on a costumer's request ...one way or another is reversible

happy regards
sakis

Jeez, now that looks terrible. An honorable audio fanatic would have declined!

;-)

LOL
Well... Not that it is an aesthetically great looking amp anyways....

I think that functionality is better this way

Do
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PREAMPs : AMB α10 + JC-80 clone | Balanced DCB1 | LDR3x | AMPs: AMB β24 | Aleph 5 | FirstOne | ML-2 | TSSA | Telos 390 Clone | My_Ref FE
DACs : TPA Buffalo II + OPC's NTD1 I/V | TPA OPUS + IVY III | Moon 380D DSD Speakers : Jim Holtz Statements | Astasia SD | Tubasson Mark 2
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Old 13th February 2012, 09:00 AM   #2248
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Nice to see you back, Fotios! Great work with latching relays etc!
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Old 13th February 2012, 12:04 PM   #2249
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Smile I made this on my weekend. 400w power amp

I made this on my weekend. 400w power amp.

Now i want to make Peavy's professional amp (Maximum Watts) . Plz share (you can email me at kamran.yousafb@gmail.com) its schematic if any body have Thanks.
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Old 13th February 2012, 12:09 PM   #2250
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Smile Please share its Schematic with parts list

Quote:
Originally Posted by Bensen View Post
Wow, very nice build! I did a search after it, for me AMB is new.
Balanced amps are rare in the diy world, they intrique me.
Any change to send me the schematic with a PM?

Greetz
Sir,

Can u plz share its Schematic with parts list & PCB (Just power amp's not protection circuit etc) etc at kamran.yousafb@gmail.com
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