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A few things. 1 - You appear to have 3 decoupling caps on the comparator, on the left side of the IC. While the V+ lead is nice and short and compact, the ground trace for the two lower (presumably sm …

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

Then you can use a 1 MHz (.0001%) crystal oscillator to drive a divide by 10,000 counter to get 100 Hz. …

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 …

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 …

There are any number of possibilities. An obvious one is the parallel load inputs A-D and the various enable inputs. Are these left floating? If so, you are asking for trouble. With 74HC, ALL inputs m …

Depending on your requirements, you may have bitten off rather more than you can chew. For discrete logic, 20 MHz will be a real challenge, especially if you need the new waveform to be precisely 180 …

Supply voltage is another factor in determining the operating frequency of your oscillator. Try replacing your battery with a 9-volt wall-wart and see what happens. …

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 …

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

You need to realize that "unlimited cap drive" doesn't buy you anything in this particular circuit, since it is not actually driving a capacitor directly. With a Vdd of 5 volts and a 1k gate resistor, …

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 …

There is not an equation as you mean it. In the case of your circuit, the non-inverting gain will be about 3.2, so the amplitude of the output will increase without limit - until it hits a limit. In …

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. …

What you want to do is possible (just barely) with 74xx ICs, as long as you don't need excessive trigger logic complexity, and as long as "xx" means something other than 7400 series. The 74FCT family …