This circuit uses uncommon Texas Instruments components today. The circuit is from an American documentation. Transistors are commonly used PNP. The display is 7 segment multiplexed.
This is the circuit of an old oscilloscope, using components from the 80s. Of course, it serves...
Found in a Linear Technology 80s integrated circuit manual this circuit has its gain controlled from...
This circuit is based on one of the first germanium transistors. The power comes from a solar cell...