[sdiy] The Korg MS-20 VCO core is oscillating!

[Magnus Danielson]

On 04/24/2011 12:25 AM, David G. Dixon wrote:
>>> Glad you got it working!
>>>
>>> Someone told me that they proof read with the paper upside
>> down. I've
>>> never bothered trying it, but I wonder if tracing a
>> breadboard rotated
>>> 180 degrees would help to avoid "seeing" the expected.
>>
>> I've found that proof-reading it alongside the schematic is
>> really useful. Following every single trace and every single
>> component. You almost end up verifying that the resistors is
>> oriented correctly that way...
>
> That's where my little Excel-based layout tool is really helpful, for both
> breadboards and handmade PCB.  I actually make very few layout mistakes now.
> When you have to be personally responsible for every trace and every pad,
> you get a very clear sense of the circuit and how it works as well.
>

You should have someone come in and break it. You never really learn how 
something works until you have tried to repair it a number of times. You 
learn the balance points of every loop, the direction of every 
current... the meaning of every diode...

Cheers,
Magnus