Timer automatic insertion keyer circuit diagram
Source: InternetPublisher:3228 Keywords: timer circuit diagram Updated: 2020/11/07
This circuit uses a simple keyed oscillator of the NE555 timer as an automatic insertion circuit for a broadcast machine with a decoding bandwidth of 2980 ~ 3080Hz. Adjust R2 to get 3042Hz. The figure also shows the speaker and microphone output selections. Adjust R3 to obtain the required input and output levels, and use variable resistors. Generally, the close keyer switch can also be connected between pin 7 and ground. Available 9V transistor radio power supply.
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