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grayure asked Would it be possible to make an amplifier using relays rather than valves or transistors?
I know basically nothing about electronics. I'm vaguely aware that some valves are functionally equivalent to relays. Does that apply to all valves, or can they do things which no relay could do in some circumstances. And, to that end, can a radio signal be amplified using a relay?
And got the following answer:
Relays are basically power amplifiers. It takes a relatively small amount of power to activate a relay which can control a larger power. Power amplification = (power out)/(power in). However, you probably have in mind an audio amplifier. This is also possible with relays but not practical. The method involves pulse width modulation(PWM) and would only be practical for very low frequencies. This method is similar to class D audio amplifiers using solid state switches instead of relays. Use at radio frequencies is not possible.
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