This low-power, low-supply voltage amplifier uses a preamplifier to achieve a high-gain configuration. The circuit is from the November 1999 issue of Electronics Now magazine.
This configuration from a 1976 technical documentation shows how to use a varicap in a direct...
In the figure we have a symmetrical power supply stabilized by a zener diode. Transformer and...
This MW receiver was found in a Raytheon circuit manual from the 1960s. Transistors are the first...