This circuit was obtained in a 1975 documentation. The maximum frequency depends on the diodes and the FET. Type 1N34 diodes and a FET BF245 can be used for frequencies up to 100 MHz.
This circuit indicates the polarity of a voltage applied to the input. The circuit can make use of...
This circuit was obtained in a Teledyne documentation from 1972. The operational amplifier admits...
The sound produced by this circuit, from a 1978 publication, depends on the humidity between the...