The figure shows an application of the LM377 in a small inverting stereo amplifier with output powers between 3 and 4 W. The circuit is from a Radio Electronics from April 1990.
With an op amp with FET, this 1977 circuit uses an LDR as a sensor and drives a relay. The relay...
With this circuit it is possible to produce RF signals up to a few tens of megahertz using TTL...
The basic idea of this 1989 circuit is to trigger a relay for a while when a call signal occurs on...