This power step for relay activation was found in the 1964 RCA transistors manual. The circuit is of the NF type and the transistors admit equivalents. R4 depends on the drive voltage.
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...
This simple metal finder uses a 100 uA indicator. The exploration coil must be constructed in a...
This circuit generates a 20 MHz sinusoidal signal from a 10 MHz crystal. It is found in the 1992...