This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz to 100 kHz and modern equivalent components can be used. The circuit is from Ferranti.
The Nerve-test is a traditional electronic game. The player must pass a metal ring through a...
We found this simple alarm circuit in a 1981 documentation. As we can see, it is a car alarm...
This Japanese commercial medium and short-wave radio uses 7 transistors and tunes the range from...