Programmable current source (CB8897E)

Found in a 90s Linear Technology documentation, this circuit supplies current to a load through a 10ohm resistor. The circuit uses period components.

Light Sensor (CB5973E)
This circuit can use any comparator or even an operational amplifier. We can use the LM339 and the...
144 MHz Frequency Doubler (CB4675E)
This circuit is from an old American amateur radio manual. The circuit shows how to use a Varicap...
Low Noise Amplifier LM381 (CB25271E)
This circuit was obtained from the December 1990 issue of Radio Electronics magazine. The circuit...