This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but the high input impedance makes it useful for radio applications.
This signal booster that ranges from long waves to about 30 MHz is recommended to be used with...
TTL square signals can be divided by 10 using this circuit. The maximum frequency depends on the...
Used in 1950s CW receivers, this type of circuit used germanium transistors. The circuit has...