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Cgs synth

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Re: Synthacon filter - hum

2006-02-10 by c10h14no2i

The cap is correct, but not a standard electro.. its a tantalum I
believe. Got the components from Elby. the transistors are not metal
can. I dont know the manufacturer of the transistors, but I did look
up the datasheets for several manufacturers w/ the same package.. they
all seem to be ok.




--- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@...> wrote:
>
> at the risk of being redundant, is the electro on the LP input
> alligned correctly?
> also did you use the same transistors specified in the schematic?
> metal cans or TO92s? its worth double checking you haven't got the
> pinouts mixed, there is a lot of variation between different makes.
> check the datasheets for the ones you are using.
> its a common mistake - especially for me
> andrew
>
>
> --- In cgs_synth@yahoogroups.com, "c10h14no2i" <c10h14no2i@> wrote:
> >
> > Ok, I replaced the IC and all is good, except for the hum.
> >
> > I get absolutely NO input on the LP input. and the hum is definately
> > being low pass filtered.
> > The other 2 inputs work.. I can hear audio and the hum.
> >
> > Ive checked all of the connections and components from the LP input
> to
> > just about everything else, and it all looks ok.
> > Could a bad transistor cause the hum, or any other bad component?
> >
> > I do have a new powersupply on the way, but to me, the clues show
> > something else might be wrong. However, I dont know what Im talking
> > about :).
> >
>

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