Suggested by Philips documentation from 1968, this circuit uses components from the era that can be replaced by modern equivalent types. The double transistor can be replaced by a matched pair.
This logic circuit can indicate both TTL (5 V) and CMOS (5 to 12 V) output levels, operating with...
We found this circuit in an old American documentation, from 1971, but the component used is still...
This circuit is from an Italian magazine Radio Elettronica of January 1977. The circuit shows how...