Delayed relay (CB10191E)

This simple SCR delay circuit for activating a relay was found in documentation from the 1980s. The components used are common today.

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Balance indicator (CB7012E)
This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are...
Reed Switch triac control (CB12238E)
In the figure we have the way to control a TIC series triac with a reed switch. The current in the...
Power Supply For Airmodel Spark Plugs (CB1177E)
This source provides a 1.5V voltage used in the power supply of model aircraft spark plugs. The...