Found in a 1947 publication, this circuit uses 4 parallel/push-pull tuber in the output stage. The circuit employs dual power supply with two rectifier tubes.
Found in a foreign publication, this sensitive circuit triggers a relay. The voltage depends on...
This circuit also functions as a phase detector. The components used are not common. We found this...
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...