We found this circuit in the February 1983 issue of Radio Electronics magazine. The 4-digit circuit is based on dedicated integrated circuits of the time. The power supply is not shown.
In the 110 V network, capacitors of 200 V or more and in the 220 V network, capacitors of 400 V or...
The OC30 power transistor is an old type of germanium from the 60s. This amplifier, using this...
Found in Maxim documentation from the 90s, this circuit makes use of components from the period. The...