4 oscillators on the wall... (fwd)

[Ken Stone]

Try putting some smaller capacitors - like 100n and 10n around the circuit.
For decoupling power supplies, these work better (especially at higher
frequencies).

Don't bundle your wiring together, as crosstalk between the wires will
affect your circuit. Make sure you are using sufficient wire guage for your
power lines, and that your pcb tracks are wide enough. try to avoid having
one osc drawing power through the tracks of another. run them all back to
common power supply connections.  

Use a real power supply. Running a 12 volt reg off 15 volts doesn't leave
enough "headroom" for decent 12 volt regulation.


>
>Yo!  question.  I just finished building 4 tb-303 oscillators on two
>seperate circuit boards. The power supplying these is 15 + going thru a
>12+ and then thru a 5+ so that I have 12+ and 5+ to power each little
>circuit. My problem is that all individual oscillators work alone but when
>you try and use more than one each totally affects the tunning of the
>other one (not audio). Coarse tuning one will change the pitch of the
>other ones and so on. I put some good sized caps on lines but this doesn't
>seem to help.  Any ideas on correcting this? Is this a problem with how
>I'm powering them? 
>
>saul
>
>
>
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                Ken Stone  sasami at blaze.net.au
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