Relay driver (CB20549E)

Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at 100 mA of coil current.

Two Transistors Flasher (CB13725E)
This flasher with a well-known configuration was suggested by a 1977 publication by Radio Shack. The...
Transistor as diode (CB23558E)
In the figure we have a practical idea for using the good junction of a partially burned...
Basic Monostable Using the 7555 (CMOS) (CB120E)
The CMOS TLC555 [equivalent to the bipolar 555] can be used as a monostable in the configuration...