This is the basic configuration of an operational amplifier sample & hold circuit. The FET and transistor are commonly used. The circuit is from an 80's documentation.
This TTL circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit has...
We found this circuit in Sperimentare magazine number 4 of 1977. The magazine no longer exists, but...
This crystal configuration can be made with triggers of any logic. The frequency is given by the...