Using only discrete components, this circuit can control loads up to 8 kW. SCRs should be appropriate and equipped with large heat sinks.
This encoded lock circuit with alarm for use in homes was found in a publication from the 90s. The...
This old circuit, from a 1992 documentation, was used with tape recorders acting as playback. The...
This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with...