Found in a Popular Electronics from the 1990s, this circuit is a 1-digit counter that advances under the command of S2. The circuit can be expanded to more digits.
This circuit was found in a 90s American documentation from the 90s. The components are from that...
In the figure we have the circuit of a clamp-type microammeter described in the Radio Electronics...
The voltage-gain for this amplifier is 10. Other operational amplifiers can be use and the Power...