📄 dtmf control.htm
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<H4><FONT face=Arial,Helvetica,Geneva,Sans-serif,sans-serif>This
article first appeared in "CQ-TV" magazine, issue 186.</FONT></H4>
<P><FONT face=Arial,Helvetica,Geneva,Sans-serif,sans-serif>I was
asked to design a unit that could be used to control
monitoring equipment at a TV repeater site. It had to accept
commands sent as DTMF tones over the repeaters audio channel and be
able to switch either AV signals or power supply feeds at currents
up to 1 Amp. The switching requirements left no option but to use
relays and the cheap and easily available 揃T53⌨️ 快捷键说明
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