Found in an English Maplin documentation from 1983, this circuit generates separate frequency patterns of 1 MHz, 100 kHz, 12.5 Hz and 10 kHz. The circuit uses components that are still common.

Found in an English Maplin documentation from 1983, this circuit generates separate frequency patterns of 1 MHz, 100 kHz, 12.5 Hz and 10 kHz. The circuit uses components that are still common.