[sdiy] Serge LM3900 VCO

[Tom Wiltshire]

On 23 Feb 2010, at 23:34, David G. Dixon wrote:

>> While we're on the topic, I've got a PCO. I don't recall seeing the
>> schematic, but it's got a 3046 on it, so I presume it's been used  
>> in some
>> sort of "heater" configuration.
>
> Does the presence of 3046 in a synth circuit always imply a heater?  I
> thought it was just a collection of general purpose "matched"  
> trannies.

|t is. You can use it for (picking a recent example) the matched  
transistors in a ladder filter. There's no heater there.

T.