This Vienna bridge multi-band oscillator circuit was found in a 1974 Ferranti transistor manual. The circuit generates signals from 25 Hz to 1 MHz in 5 bands selected by the capacitors.
This TTL circuit uses 5 NAND gates of 7400 integrated circuits. It must be powered with 5...
Frequency Indicator (CB6342E) This simple circuit was found in an Exar publication from the 1970s....
Texas Instruments SN74HCS32 Q1 2-input OR gate This Texas Instruments integrated circuit has 4...