This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW with 6 V power from ordinary batteries. The circuit is of the superheterodyne type.
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...