Steve Anderson wrote:As I mentioned, the original ramp generators are not really designed for multi-frequency work without a lot of capacitor and resistor switching. Have a look at the circuit diagram of an analogue oscilloscope timebase. You'll see what I mean.
Yes Steve i was sort of expecting to do this i put in the connections for the caps solder desolder i could remove and test various capacitors with the various clock frequencies and use a multi switch when i know what caps are needed.
[/quote]It is very easy to do this with a small 14-pin DIL microcontroller but I guess that's maybe not the way you wish to go. It measures the input frequency and sets the charge current of the capacitor such that it's a constant amplitude whatever the frequency. It would be no harder than using a 74HC00.
For the time being perhaps some thought needs to be put into this without using a micro.
Steve A.
Well the idea at the moment is to sync the sawtooth oscillators another way would be may be just convert the clock square wave direct to a a sawtooth and amplify it .i suppose just see how it gos as is ....the other way you just mentioned i didn't know about ,just like to use what i have handy and what works i have no dislike of any idea just what i can do what works it makes it more satisfying when i use what i have laying around like those multi position switches.