Speed and direction control for shunt motors (CB5418E)

This circuit for shunt motors was found in an American 1980s documentation. The SCR should be rated for the controlled load as well as the diodes.

Digital Audio Power Meter (CB5447E)
This circuit uses uncommon Texas Instruments components today. The circuit is from an American...
One Transistor Radio (CB1359E )
Any NPN general purpose transistor can be used on this simple AM radio. The coil consists of 100...
ECX 32 SMD Quartz Crystals
June 2017 - ECM032 series of SMD quartz from ECS crystals can now be obtained from Mouser...