Schematics / Oscillators
Wein Bridge Oscillator
As a piece of test equipment, an audio oscillator has to be considered essential for anyone working in with hi-fi gear....
200Mhz to 400Mhz Voltage Controlled Oscillator 
If you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine. It uses four voltage controlled capacitors to change the frequency....
Tiny Programmable Oscillator Spans Three Decades from 5Khz to 20Mhz
By merging a digital potentiometer with an oscillator chip, we can make a very small programmable oscillator (1 uMAX and 1 SOT23 package). Not only does this circuit take up very little board space but it can be controlled with only three signals from a microprocessor. ...