We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The bridge diodes must withstand the current of the controlled load.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
This circuit uses a PLL4046 oscillator to excite a piezoelectric ceramic. The circuit is from an...
Found in Linear Technology documentation, this circuit drains only 70 uA of the monitored circuit....