This commercial transistor tester circuit (EICO 666) is from a Japanese publication from the 1960s. The switch selects the types of test with the switching of the terminals and the gain ranges.
) This interesting circuit of 18 multiplexed LEDs was found in the February 1992 issue of Radio...
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...