tested capacitor amplifier - Page 1
Forum section: electronics / beginners

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 10:43:17 am
content: Ive just tested it, and it works fine. This makes a really cheap motor driver.Id like to see if FALSTAD simulates it properly. Note the signal in has to be a separate power source, to the power in.The output has a small 1 ohm load, just to make the conduction work.The capacitance can be anything, but i tested it on half a microfarad, with electrolytics, but it works better with symmetrical capacitors I think.

author: Manul
author_rank: Super Contributor
timestamp: September 08, 2021, 01:25:27 pm
content: Quote from: Capernicus on September 08, 2021, 10:43:17 amWell, good for you

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 01:53:20 pm
content: I havent tested this, but if u dont want to use too many capacitors you can get a logarythmic optimization and do a multilevel compound like a darlington pair.this gets x64 amp in 18 capackerz.

author: Ian.M
author_rank: Super Contributor
timestamp: September 08, 2021, 02:42:42 pm
content: Video or it didn't happen!Its *possible* to get amplification out of certain types of capacitor in a parametric amplifier circuit, but the above is *NOT* how to do it, and as it requires pumping with a signal at typically twice the one to be amplified to provide the energy and frequency selective filtering on input and output, there is no way it will work at DC.https://hackaday.com/2019/04/26/parametric-amplifiers-and-varactors/will give you a light overview.Also, Falstad is known to give odd non-convergent results with certain pathological circuits that may give the illusion that passives are producing gain. The same circuit in real life (if buildable) or a SPICE simulator will not show the effect (though SPICE simulators can also produce non-realistic results). Therefore Falstad (or even a SPICE program) simulating something "properly", isn't actually a guarantee the effect is physically realizable.

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 02:46:33 pm
content: Video is on its way. .. but youll have to forgive the dodgy web cam, its running at 5fps at the moment and I cant fix it cause my software comes from the old version of windows 10 and doesnt run anymore.Its tested in real life not Falstad.I know it works, cause I just lit up an led with just a 9v battery with 300k resistor on it! no chance that would work without an amplification.BRB, with video!

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 02:54:31 pm
content: well its blurry as hell, sorry about that I need a new web cam, but it did demonstrate it.

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 03:02:44 pm
content: did another vid, sorry its terrible youll just have to concentrate, but its switching on and off, and its 300kohm resistance on the battery, and im disconnecting and connecting the 9v battery from the circuit.

author: Ian.M
author_rank: Super Contributor
timestamp: September 08, 2021, 03:33:14 pm
content: <LOL> NO!If you were serious, you'd have the webcam fixed somewhere looking down on the circuit, so the image is steady, and have some multimeters in the field of view showing the input to and output from your circuit. Some moving the webcam might be needed to give a long shot to show the multimeter leads don't go off to a PSU to show you aren't cheating, but 99% of the time it should be fixed, even when showing closeups of the circuit.Its worth noting that a LED can produce measurable light output all the way down to 1nA forward current and beyond. Typically a high efficiency LED can produce visible light output with only microamps of forward current. You mentioned 9V and three 100K resistors in series, which would give over 20uA, plenty to visibly light a high efficiency LED observed in a dimly lit room. In practice a white LED would *NOT* have 3V Vf down at tens of uA If, so you'd see a bit more current. I'd estimate about 24uA for a typical 30mA white LED. Also note that electrolytic capacitors rely on wet chemistry, and at very low currents can look rather like (very poor) batteries . . .

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 03:38:39 pm
content: Yes, sorry about the very poor presentation, I am totally disorganized lately.I can make a vid of me plugging the 9v with the 300kohm into the led and get no light if you want!Otherwise, you can put together the circuit yourself, its only very simple. its a 1c amplifier claim!!! =)

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 03:45:14 pm
content: powering led with just the battery by itself.

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 06:02:48 pm
content: guess what... it works with just 2 capacitors. the volts are just cancelling out!!it means that 2 .001c capacitors, are as good as a transistor. but they never believe the fighty one!!!

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 06:13:14 pm
content: And works with a PICOfarad!!!Call it the "2 puff transistor"

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 07:44:45 pm
content: Its a bit blurry, but this is perfectly readable.Can someone else build this and see if it works for them?? Its quite disturbing.And you can put it in darlington formation, and then the led should be really bright!! - ill do that tomorrow, and see if the madness doesnt stop!!!

author: Capernicus
author_rank: Frequent Contributor
timestamp: September 08, 2021, 07:59:43 pm
content: Guess what.... dont even need the second "output capacitor" you just go straight through the led with a wire.Its just the smaller backcharge on the capacitor, is enough to let more through??

author: xavier60
author_rank: Super Contributor
timestamp: September 08, 2021, 08:21:57 pm
content: Please dont let your audio overload, It's unbearable to listen to.

author: Simon
author_rank: Unknown
timestamp: September 08, 2021, 09:01:24 pm
content: It starts as a joke then becomes annoying. Now go beg forgiveness for the wasted youtube resources on your poor excuse of a joke.