This circuit uses uncommon Texas Instruments components today. The circuit is from an American documentation. Transistors are commonly used PNP. The display is 7 segment multiplexed.
Wired to the output of any amplifier this circuit makes an incandescent lamp flash according the...
Great sensitivity for the circuit can be obtained with a Darlington amplification step for the...
This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon...