We found this circuit in a 1980s Motorola documentation. The circuit makes use of common operating and the voltage depends on the used type. The components are for a frequency of 500 Hz.
Based on the well-known LM3914, this circuit has a transistorized and inverters stage, triggering...
This circuit was found in Ferranti's 1974 transistor manual. Transistors are general purpose types...
Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to...