This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This circuit allows you to read temperatures with a common digital voltmeter. We found it in the...
This Morse code practice circuit produces a tone at the speaker whose frequency depends on C1 and...
This circuit consists of a voltage regulator for 6 V batteries with a very low voltage drop. The...