With this circuit it is possible to measure RF signals with a common multimeter. Signals up to 200 MHz can be detected. The diode supports general-purpose equivalents.
An FM receiver with good sensitivity and with acceptable sound quality in the strongest stations, can...
This filter has a factor Q = 10 (selectivity), and its frequency can be changed as shown in the...
With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can...