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 flasher was found in an old Hands On, but uses common components. The optocoupler can be...
The LM12 is a high-power operational amplifier capable of providing a 4 A output current with a 40...
The circuit presented was found in the Linear Applications Handbook of the National Semiconductoir of 1994....