Optical Audio Transmitter with Simulated Photo Resistor

350

03:13:03

This time I removed the 100kOhm resistor that was supposed to be a photo resistor and replaced it with a MOSFET and current controlled voltage source that is controlled by the current through the LED.

published 7 years ago

gravityx

7 years ago

Interesting.. i wonder if the relatively slow response of an ordinary LDR would cut if for audio frequencies thoug. Have you tried? Otherwise an optocoupler consisting of an LED and a phototransistor might work. The tricky bit here would be figuring out how to bias the transistor, it might not be particularily well suited to be operated in the active region, have to try it out :)

jason9

7 years ago

Maybe a phototransistor could be used instead. Unfortunately, I am limited to simulator only since I don’t have anything of use at home.

FabioDVigo

7 years ago

how can i publish a circuit

jason9

7 years ago

Tap on the icon in the top right corner that looks like a square with a plus in it’s bottom left corner and that has it’s top right corner folded in towards the viewer. Once you’ve tapped it, make your circuit, press the save button (probably looks like an arrow pointing into a folder), select “public”, give it a title and description and hit “save”.

jason9

7 years ago

If you go into an example circuit or someone else’s circuit and then delete all the components and make a new circuit, it won’t let you make it public because it is “derived” from another circuit and is actually someone else’s circuit as far as the simulator is concerned, so you can’t post it because that would be posting it under your name when it’s someone else’s circuit.

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