Designing with transistors - WAS RE: [sdiy] Ofsetting LFO output

[Tim Parkhurst]

> -----Original Message-----
> From: Michael Ruberto [mailto:frankentron at hotmail.com]
> Sent: Wednesday, June 01, 2005 7:51 AM
> To: seb at burnit.co.uk; lenham at clara.co.uk
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Ofsetting LFO output
> 
> wouldn't it be simpler to just use a single transistor as a switch?
> clamp
> the negative peak off of it's base with a diode. I used something like
> this
> once to convert the sync out from a Juno 6 so it would work with the
> gate in
> on the Realistic MG1. it used 3 parts - 1 transistor, 1 resistor, 1
> diode.
> worked great too. another good idea is to use the 555 timer in 1 shot
> mode
> if you need a specific duty cycle for the clock input. plenty of 555
> schematics on the web too...
> 
> M.A. Ruberto
> 

I've been in situations like this, where all I needed was a simple switch,
offset, level shift, inversion, etc. I know there are many cases where a
transistor or two would do the trick, but I don't know enough about discrete
(i.e., transistor) design, so I end up using an op amp. This is okay if I
happen to have an extra op amp stage that's not being used, but that always
isn't the case. I've also run into cases where all I needed was one analog
switch (as opposed to the four that come in something like a 4066). Can
anyone recommend sites for learning more about designing with transistors
(hopefully with lots of example circuits)?


Tim (needs an extra stage) Servo

"Imagination is more important than knowledge." - Albert Einstein

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