This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
This circuit is from a Mallory 1968’s documentation. The integrated circuit is of the time and the...
This circuit generates low-frequency sinusoidal signals. The variable capacitor is dual and the...
With this circuit, a well known configuration, small speakers and even low-impedance headphones...