[sdiy] Help trouble shooting mfos echo rockit

[JoeF]

Roman and Pete, TY. Roman, I want to move to the next level. Could you pont the way to how to determine current flow. I know how to check voltage and perform audio traces but I don't know how to determine current. If it's not too difficult, could you explain or point to a site that would explain. Tx again. JoeF.

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On Nov 20, 2022, 2:44 AM, at 2:44 AM, Roman <modular at go2.pl> wrote:
>Measure the Iabc current going to LM13600 to check if they are open at
>all. Measure voltages at OTAs and opamps outputs to see if they are not
>terribly close to one of supply rails. 
>
>Roman 
>
>---- Użytkownik JoeF napisał ----
>
>>Hello all, not sure if this is the right place to ask for guidance
>but, I'll try. I have put together an Echo Rockit I got as a kit. And,
>of course I need to troubleshoot.
>>This is an oscillator and external input into a VCF into a PT2399
>delay. I am getting no sound at the output and I believe it is because
>the VCF is not functioning. I have audio traced a signal to the VCF
>from the input and the internal oscillator. And, I have jumped the
>signals around the VCF straight to the delay and then I get output and
>have verified the delay is operating as expected. I have correct power
>to all IC power pins. The transistors are getting power on their source
>pins.The IC in the VCF is an 13600D which I have spares of and have
>swapped to no avail. I have re-soldered the components in the VCF
>circuit. I don't have extras of the MPF102 transistors and am
>questioning whether I burned them up when I soldered them in? What do
>you think?
>>What's next? Thanks for any advice in advance. JoeF.
>>
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