This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply can be between 3 and 12 V typically. The counting speed depends on C1.
This basic op amp filter configuration was found in July 1975 Radio Electronics magazine. The...
This sensitive receiver for the medium wave range was found in Radio Electronics magazine from...
This two-band receiver capable of tuning medium waves and the 3.5 to 10 MHz band was sold in Japan...