This crystal configuration can be made with triggers of any logic. The frequency is given by the formula next to the diagram. This setting is specifically for TTL.
This circuit is from an American technical documentation from the 70s, but it can be easily...
This circuit converts a range of input voltages at frequencies from 800 Hz to 3.7 kHz. This is a...
This circuit has a configuration that is widely known and explored on our website. The SCR can be...