XR2206 function generator circuit | ElecCircuit.com
Cheap DDS Function Generator
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operational amplifier - Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz) - Electrical Engineering Stack Exchange
Short pulse generator on TTL (SN74HCT74M and so on).
ttl - Clock signal generator using 7400 - Electrical Engineering Stack Exchange
ICL8038 Mini function generator circuits | ElecCircuit.com
TTL <> RS232 Converter
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Function Generator XR2206
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Random Sequence Generator based on Avalanche Noise