Address decoder using the 74LS138 (CB20537E)

This decoder circuit 3 of 8 was found in a publication for PCs from 1992. The circuits are TTL and must be powered with 5 V.

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...