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Take a dual-supply oscillator of your choice. Replace the positive supply with one with twice the amplitude. Instead of a negative supply, ground these points. … The reference does not have to be exactly half the positive supply voltage, but doing this will maximize the voltage swing you can get for the AC value of the oscillator. …

EDIT - Not only can you start the oscillator precisely, this topology will produce a complete last pulse. …

The output (pin 3) is alternately charging and discharging the cap. If the output is high, the cap charges up. When it reaches about 6 volts, the internal flip-flop is reset, pin 3 goes to zero, and t …

Why have, for instance, 4 oscillators which you want to be synchronized, rather than 1 oscillator and a single hex buffer chip? …

This is a classic square wave as detected by a scope set up with an inadequate ground connection. A few tips (in order of importance): 1 - Connect the scope ground as close to the clock ground as pos …

I suggest you buy a clock oscillator, ready-made. Try eBay, and search on "50 MHz clock", or try Digikey or Mouser. …

"but... what noise? Audio noise? Electric noise coming from the circuit?" Every circuit (except for superconductors. Maybe) has noise. Every resistor produces a noise voltage, as thermal energy jostl …

Once you see this, start reducing the gain ratio, and you'll see the startup time gradually increase. 3 - As is true of any open-loop oscillator, if you have enough gain to sustain oscillation, you almost …

During most of the cycle, one zener is reverse-biased,and the R5/D1/D2 branch is effectively an open circuit. As such, it can have no effect on the loop frequency. As the amplitude of the output appr …

but the problem is that because Vsat- is equal to zero, the capacitor won't discharge to 0 and I have researched a lot on the topic and can't find anything. Your problem is, as you say, the f …

Just as an experiment, try looking at your oscillator output on the scope and try moving the probe around (changing the angle of your hand and probe). … Second, especially with the oscillator, is making sure you have properly decoupled it. …

A Wein bridge oscillator requires a gain of 3 at the resonant frequency, and for your configuration that means a 2:1 (or better) ratio between R1 and (R2 + R2a). …

Also, for what it's worth, for relatively low oscillator frequencies all of the gates should be Schmitt triggers, such as a 74(HC)14. …

Now that you have provided a picture, I can have a go at advice. The only way I can see to repair that coil is to take the two cut ends and peel them back 180 degrees in each direction, scrape enamel …

Another possibility is component placement. You've taken advantage of symmetry and placed, for instance, R1 and R3 at the same location but on opposite sides of the board. Same with C1 and C2, and R2 …