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Old 10th October 2012, 01:32 PM   #3391
mathez is offline mathez  Indonesia
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hi shaan, can i supply with +/-45v for SSA ,is there any change
thanks.
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Old 10th October 2012, 01:45 PM   #3392
shaan is offline shaan  India
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Originally Posted by mathez View Post
hi shaan, can i supply with +/-45v for SSA ,is there any change
thanks.
I haven't tried it with +-45V but a quick simulation shows the following changes.

1: 470ohm Zener feed resistor increased to 1K.
2: 1K2 Current feed resistor might need to be increased to 1K3. As the higher PS potential causes high current draw in VAS.
3: Removal of one of the 1N4148 diodes and use only one to bias the FETs to about 175mA.

The input bias and VAS bias must be carefully set with varying the 1K2 resistor. You will probably get reduced THD with higher PS voltage. And of course more power into same load.
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Old 10th October 2012, 01:50 PM   #3393
mathez is offline mathez  Indonesia
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okey shaan,coz i have etch the PCB,but my PSU +/- 45v..
thanks
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Old 10th October 2012, 01:51 PM   #3394
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Hi Shaan,
Thank you, I did the same thing with Version 1.4 PCB post #498. Version 1.4 is corrected now and I have all the parts for it so,I will start on it while awaiting parts and new PCB material for the PEECEEBEE.
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Old 10th October 2012, 02:01 PM   #3395
shaan is offline shaan  India
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Originally Posted by mathez View Post
okey shaan,coz i have etch the PCB,but my PSU +/- 45v..
thanks
Nice.

Just a little tip for safety. The single 1N4148 diode's anode goes to the previous upper 1N4148's anode, and the cathode goes to the lower one's cathode. Nothing goes through the two holes inside the blue borders shown in the attachment.
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Old 10th October 2012, 02:03 PM   #3396
shaan is offline shaan  India
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Hi Cambe I saw that post. ( )

All the best with the V1.4 PCB.
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Old 10th October 2012, 02:13 PM   #3397
mathez is offline mathez  Indonesia
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Quote:
Originally Posted by shaan View Post
Nice.

Just a little tip for safety. The single 1N4148 diode's anode goes to the previous upper 1N4148's anode, and the cathode goes to the lower one's cathode. Nothing goes through the two holes inside the blue borders shown in the attachment.
ok shan , i will always need you,to finish this amp
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Old 10th October 2012, 02:24 PM   #3398
naf is offline naf  Indonesia
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ok shan , i will always need you,to finish this amp
number 20 of 20 Reasons To Go For SSA
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Old 10th October 2012, 02:30 PM   #3399
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Just a little tip for safety..
Don't you like straps ?
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Old 10th October 2012, 02:40 PM   #3400
shaan is offline shaan  India
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Don't you like straps ?
No.

But yes despite looking ugly, they might be useful here.
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