BOZ preamp project
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 16th October 2006, 04:42 AM #21 likeDIY diyAudio Member   Join Date: Sep 2006 Hi guys, the output capacitor C103 =10uF can be changed by 22uF? Will the output frequency response changes alot?
 16th October 2006, 06:12 AM #22 Mad_K   diyAudio Member     Join Date: Sep 2002 Location: Norway It will go down, which is a good thing (-3dB from 3 to 1,5Hz nominal) __________________ Mads K
 16th October 2006, 06:14 AM #23 Nexus   diyAudio Member   Join Date: Aug 2003 Location: The Netherlands 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. Best Regards: Nexus
 18th October 2006, 08:18 AM #24 likeDIY diyAudio Member   Join Date: Sep 2006 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?
 18th October 2006, 08:22 AM #25 Mad_K   diyAudio Member     Join Date: Sep 2002 Location: Norway That's fine __________________ Mads K
 19th October 2006, 02:45 AM #26 likeDIY diyAudio Member   Join Date: Sep 2006 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.
 19th October 2006, 05:37 AM #27 Mad_K   diyAudio Member     Join Date: Sep 2002 Location: Norway 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? __________________ Mads K
 19th October 2006, 06:33 AM #28 likeDIY diyAudio Member   Join Date: Sep 2006 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.
 19th October 2006, 06:44 AM #29 likeDIY diyAudio Member   Join Date: Sep 2006 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?
 19th October 2006, 07:13 AM #30 Mad_K   diyAudio Member     Join Date: Sep 2002 Location: Norway The pcb layout in the original article is bottom viewed from bottom. How did you make the pcb? __________________ Mads K

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