This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a heat sink. R1 adjusts the load current. The transformer has 1 A of secondary current.
Here we show how to add a reset key to the monostable using two NAND gates (CB127E). When the key...
This TTL dice was found in an old American 1980s documentation, but can still be easily assembled....
This circuit was found in a 1994 publication. It draws 1 of 41 LEDs when we press and then release...