Found in a Popular Electronics from the 80's, this circuit makes use of a time integrated to control a relay in a timed way. R2 determines the activation time.
This circuit was obtained in a 1976 English magazine, and can be assembled with equivalent...
This amplifier is from a 1990s Linear Technology component manual. The circuit requires...
This circuit can shift the phase of a signal from 0 to 360º. FETs admit equivalents and the...