Found in an Elektor from the 90s, this circuit is suitable for viewing audio signals on an oscilloscope. The operational amplifier admits equivalent.
This circuit has a logarithmic response sourcing signals to na analog meter. The meter is a 200 µA or...
This circuit is from the 80's documentation. The integrated circuit is from the time but can be...
This circuit was obtained in a 1980 publication and was suggested for balls, parties, vehicles...