This 4-waveband converter circuit was found in Radio Craft September 1948. The power supply is not given, but the supply voltages are indicated.
This interesting circuit, which can be used as an alarm, was found in a 1997 documentation. It...
We found this circuit in the National Semiconductor FET manual. The components are calculated...
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...