This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
We found this circuit in the Linear Applications Hanbook of the National Semiconductor in 1994. The...
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...
This circuit triggers a load when the sensor detects humidity. The triggering point is adjusted by...