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This is a very simple square wave generator circuit built with IC 74LS00 that can generate square signals with frequencies between 20 Hz and 1 MHz. Its stability is good enough for most applications.

The circuit of Figure 1 generates sinusoids ... This very-low-frequency sine- and square-wave generator requires few components, but provides low-distortion outputs (derived from LTspice simulator).

The simplified block circuit shows IC1 operating as a square-wave generator with frequency determined ... 1. The block diagram shows how three low-power audio amplifiers (LM386) are configured ...