This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from the era. Observe the input and output voltage.
This circuit is from Motorola's Linear Interface ICs from 1993. The circuit uses a booster...
By pressing and releasing PB1, only one LED is lit, drawing a number from 1 to 6, as in a die. The...
This circuit uses a 709 operational amplifier that is no longer common today. However, the same...