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100W Ultimate Fidelity Amplifier
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Old 16th April 2018, 06:35 PM   #10261
olafk is offline olafk  Germany
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It is long ago. I do not think 50k is a good idea. If I remember correctly, the pot is in the feedback loop. I do not know how it changes the gain.
Also may be that the potentiometer has to be mounted on the copper side to gets louder when turning to the right. Sorry for incomplete information.
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Old 16th April 2018, 07:05 PM   #10262
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by mantrieSolder View Post
can i substitute the pot.5k with 50k because in my country this part is so hard to find it.
i am sorry my bad english.
regard mantrieSolder
You can not use 50k for A2 preamp but you can use it with TB1 preamp.
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Old 17th April 2018, 05:34 AM   #10263
Yuriy64 is offline Yuriy64  Russian Federation
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Hello Mr. Mile, I sent you an e-mail, but you did not answer.
I want to make a button switch on the amplifier, in the network found this board:
APEX_on_off.JPG — Yandex.Disk
I did not find the circuit schematic, so I drew from the board. Is the circuit correctly formed?
APEX ON_OFF Schematic.GIF — Yandex.Disk
Used this PCB:
APEX ON_OFF LAY6.GIF — Yandex.Disk
APEX ON_OFF LAY6 FOTO.GIF — Yandex.Disk
Result:
1. When i turn on 220V - immediately turns on the load, and the LED is very dim, I probably replace the 1k resistor on the 510R.
2. When I press the button is with an interval of 5 seconds - an uncertain switching, may turn on, or it may not turn on.
3. The transistor BD241 is heated. Does he need a radiator?
Tell me please how correctly the circuit should work, if I drew it circuit schematic correctly, and how to achieve a stable switching?

I'm sorry for my bad english.
I could not add pictures, so I inserted links.

Last edited by Yuriy64; 17th April 2018 at 05:40 AM.
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Old 17th April 2018, 06:52 AM   #10264
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by Yuriy64 View Post
Hello Mr. Mile, I sent you an e-mail, but you did not answer.
I want to make a button switch on the amplifier, in the network found this board:
APEX_on_off.JPG — Yandex.Disk
I did not find the circuit schematic, so I drew from the board. Is the circuit correctly formed?
APEX ON_OFF Schematic.GIF — Yandex.Disk
Used this PCB:
APEX ON_OFF LAY6.GIF — Yandex.Disk
APEX ON_OFF LAY6 FOTO.GIF — Yandex.Disk
Result:
1. When i turn on 220V - immediately turns on the load, and the LED is very dim, I probably replace the 1k resistor on the 510R.
2. When I press the button is with an interval of 5 seconds - an uncertain switching, may turn on, or it may not turn on.
3. The transistor BD241 is heated. Does he need a radiator?
Tell me please how correctly the circuit should work, if I drew it circuit schematic correctly, and how to achieve a stable switching?

I'm sorry for my bad english.
I could not add pictures, so I inserted links.
Circuit is correct. Use n.o. push button switch. BD241 must be hot no need to use heatsink.
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Old 17th April 2018, 07:02 AM   #10265
Yuriy64 is offline Yuriy64  Russian Federation
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Yes, I'm using n.o. push button switch. I do not know how to overcome the instability of switching, and rattling contacts relay.
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Old 17th April 2018, 07:44 AM   #10266
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by Yuriy64 View Post
Yes, I'm using n.o. push button switch. I do not know how to overcome the instability of switching, and rattling contacts relay.
Switching is stable in this circuit, something must be wrong in your build.
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Old 17th April 2018, 09:36 AM   #10267
sanbadgujar is offline sanbadgujar  India
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Default need help about AX-14

Hello Apexsir

I make your AX-14 Amp today, during testing amp I got dc offset 40vdc and the same voltage on 0.33Ohm resister.I make all connection as you mention
Connect Input ground to PSU ground, a short input terminal, use 10 Ohm 10w resister instead of fuses. My supply voltage is +/-47Vdc.
What are the problems? please see attached photo and help me.
Attached Images
File Type: jpg img.jpg (672.5 KB, 461 views)
File Type: jpg IMG_20180417_142309.jpg (766.2 KB, 436 views)
File Type: jpg IMG_20180417_142231.jpg (982.5 KB, 417 views)
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Old 17th April 2018, 09:44 AM   #10268
prasi is offline prasi  India
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100W Ultimate Fidelity Amplifier
Which layout did you use? Check the diode orientation.
If I remember correctly, the original had wrong orientation which was later corrected. Check my layout and sch posted posted in this thread some time ago.
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My revamped site https://sites.google.com/site/analogdesign1234/
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Old 17th April 2018, 10:48 AM   #10269
sanbadgujar is offline sanbadgujar  India
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Dear prasi
I am using following layout . and I am get -40dc on sp out please help
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File Type: jpg IMG_20180417_161104.jpg (366.0 KB, 400 views)
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Old 17th April 2018, 12:20 PM   #10270
alex mm is offline alex mm  Romania
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Quote:
Originally Posted by sanbadgujar View Post
Dear prasi
I am using following layout . and I am get -40dc on sp out please help
I think you forget to connect signal ground from input to GND . See red line in attached picture.
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File Type: jpg IMG_20180417_161104.jpg (676.0 KB, 356 views)
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