Author Topic: Analog HFBR amplifier  (Read 239 times)

Offline TMaxElectronics

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Analog HFBR amplifier
« on: November 21, 2020, 08:08:47 PM »
I have noticed quite a few new old stock analog HFBR receivers popping up on ebay for cheap recently, and decided to try using them instead of the TTL ones usually used for interrupter inputs.
They can't just be used as a drop in replacement unfortunately, as they have an off state voltage of around 2V and (depending on the received signal strength) a 500mV higher on state level, but a simple transistor circuit can turn that into a 0-5V inverted TTL output:


just thought I'd put this here incase somebody else wants to use them :)

Offline USAMAN

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Re: Analog HFBR amplifier
« Reply #1 on: November 30, 2020, 03:07:30 AM »
Is this applied to the optical module?

Offline TMaxElectronics

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Re: Analog HFBR amplifier
« Reply #2 on: December 01, 2020, 11:21:56 AM »
How exactly do you mean? The circuit gets connected between the output of the module and the circuitry that is designed to take the normal receivers.

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Re: Analog HFBR amplifier
« Reply #2 on: December 01, 2020, 11:21:56 AM »

 


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