This shield circuit is from a 1968s Motorola documentation. The relay is according to the supply voltage. R1 can be reduced to lower trigger voltages.
August 2017 - Mouser Electronics is offering a new range of Ohmite ceramic heat sinks. The new...
This circuit has adjustments for both the time the signal is at high and low levels. Inverter or...
This flasher circuit was found in Radio Electronics from the 90s. The circuit must be powered by a...