An alternate is to provide a software solution for a cheap computer chip. Custom chips or old stock are available, but are expensive. Lower frequencies were generated by dividing each output through counter ICs, providing each input frequency divided by a power of 2. Almost all of the TOGs took an input frequency derived from a 2 MHz crystal oscillator circuit and provided twelve or thirteen square waves of the right pitches by dividing this input frequency by factors from to This provided square waves with frequencies between and Hz.
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