Hello,
I am wanting to build a circuit which when a 5 VDC input goes to zero volts (not necessarily ground) the circuit produces 9 VDC output of up to 100 ma of current from a small "transistor" battery. Does anyone have any ideas? I would like to also be able to adjust the output from 5 to 9 VDC.
This might seem a bit strange, why would I want to produce 5V when 5V goes to zero? I need to use this for when the radio signal into a UHF PIC receiver goes to zero and subsequently the output of pin D1 goes from 5 VDC to zero volts (or close to it). I want to build a solid state circuit which will produce a voltage when that happens to cause an alarm in the form of a voltage output; the full 9 VDC battery voltage of the device. I could do this with a normally open/NO relay too by keeping it energized when the signal was present and then when de-energized close to pass voltage to another device, in this case a piezo buzzer, but I don't want to suffer the continuous current draw of the coil if using a magnetic relay.
I am wanting to build a circuit which when a 5 VDC input goes to zero volts (not necessarily ground) the circuit produces 9 VDC output of up to 100 ma of current from a small "transistor" battery. Does anyone have any ideas? I would like to also be able to adjust the output from 5 to 9 VDC.
This might seem a bit strange, why would I want to produce 5V when 5V goes to zero? I need to use this for when the radio signal into a UHF PIC receiver goes to zero and subsequently the output of pin D1 goes from 5 VDC to zero volts (or close to it). I want to build a solid state circuit which will produce a voltage when that happens to cause an alarm in the form of a voltage output; the full 9 VDC battery voltage of the device. I could do this with a normally open/NO relay too by keeping it energized when the signal was present and then when de-energized close to pass voltage to another device, in this case a piezo buzzer, but I don't want to suffer the continuous current draw of the coil if using a magnetic relay.
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