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1KHz Square Wave Generator Circuit
Two Tone Signal Frequency Generator 500Hz and 1kHz [ Unassembled kit ] | eBay
Square Wave Generator Circuit with OP AMP IC 741 – Circuit Schools
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DS1kGen - Precision 1 kHz Audio Sine Wave Generator
KNACRO NE555 Pulse Module Square Wave Rectangular Wave Signal Generator Frequency Duty Cycle Adjustable DC5-15V