This circuit is from a 1968s Motorola documentation. The load can range from 10 to 100ohm and the transistor supports a modern equivalent such as 2N2222 or BD135.
This circuit was found in the November 1974 Radio Electronics magazine. The voltage depends on the...
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...
In the figure we have an interesting configuration in which we took advantage of the very high...