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Old 16th October 2006, 04:42 AM   #21
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Hi guys, the output capacitor C103 =10uF can be changed by 22uF? Will the output frequency response changes alot?
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Old 16th October 2006, 06:12 AM   #22
Mad_K is offline Mad_K  Norway
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It will go down, which is a good thing (-3dB from 3 to 1,5Hz nominal)
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Old 16th October 2006, 06:14 AM   #23
Nexus is offline Nexus  Netherlands
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Hello likeDIY,

That will depend on the impedance which loads your BOZ.

You can calculate it out with:
Fc=1/2*pi*R*C.

where Fc= your freq response
R=the load impedance for your BOZ
C=10 or 22uF.


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Old 18th October 2006, 08:18 AM   #24
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Ok, I will give it a go with a 22uF.

The values of resistors must exactly the same as in the circuit? I'm abit lazy not to make the 33.2K and 22.1k, or 4.75K, in stead I just make it 33k, 22k, 4.7 respectively. Would it be much difference?
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Old 18th October 2006, 08:22 AM   #25
Mad_K is offline Mad_K  Norway
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That's fine
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Old 19th October 2006, 02:45 AM   #26
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Help help help.
It's blown up !!!!!

After connecting to the AC source, it's blown up :-(

The two resitors R2 and R3 are the first to get fire...

Please help, what is the problem? I'm quite sure that I connect the polar of the components correctly.
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Old 19th October 2006, 05:37 AM   #27
Mad_K is offline Mad_K  Norway
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Your amp is drawing a lot of current! What sets the current is the voltage at the mosfet's Source and the source resistor; are R101, P102, and R108 correct value and placement? Or maybe you have a short circuit (to gnd) somewhere? Did you smoke any other components?
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Old 19th October 2006, 06:33 AM   #28
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I think I should check the P102, how can we indicate the CW and CCW for the P102 as shown in the circuit?
As soon as it gets smoke, I disconnect the power, so hopefully no other things get burn.
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Old 19th October 2006, 06:44 AM   #29
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One more point, before making the PCB, I have mirrored the image and print it out, It might be a problem with the pin connection?
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Old 19th October 2006, 07:13 AM   #30
Mad_K is offline Mad_K  Norway
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The pcb layout in the original article is bottom viewed from bottom. How did you make the pcb?
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