This circuit was obtained from a Linear Technology manual from the 90's. The integrated circuits are from the time and could possibly be tested as modern equivalents.
We present a DC-DC converter circuit that can operate with input voltages from 2.4 V to 14 V and...
This excellent 3-transistors audio preamplifier is suitable for use with low impedance...
This TTL circuit was found in a 1978 technical documentation. The power must be supplied with 5 V....