This 2-tube amplifier was found in a Japanese publication of 1964. The circuit has excellent sound quality. The power supply is not given and must provide a voltage of 300 V.
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
This logic circuit can indicate both TTL (5 V) and CMOS (5 to 12 V) output levels, operating with...