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.
Found in Motorola documentation from the 90's, this circuit has a high input impedance. The power...
This 5 V x 8 A power supply was found in Siliconix documentation. The unit operates with a 24 to...
This is a well-known oscillator configuration with complementary transistors. In this case, the...