Does this circuit work? - Page 1
Forum section: electronics / beginners

author: THATguy
author_rank: Regular Contributor
timestamp: January 01, 2018, 06:36:57 pm
content: The Z switches lead to AC power, the capacitor is fully charged.Battery A is being charged.When either of Y switches is turned on, they also turn Z switches off.Does this work?I made a mistake with Y switches; should not have said they are asynchronous, as this would prevent both from being switched off at the same time.Both Y switches cannot be switched on at the same time.

author: THATguy
author_rank: Regular Contributor
timestamp: January 01, 2018, 07:43:47 pm
content: Would the battery then try to charge the capacitor?Is there a major flaw with that circuit?

author: THATguy
author_rank: Regular Contributor
timestamp: January 01, 2018, 08:14:50 pm
content: What I may need to do is have one battery terminal going to ground, perhaps with a AC/DC transformer and bridge rectifier between capacitor and battery. As seen in this video.https://youtu.be/VRhSZCiyJQo

author: THATguy
author_rank: Regular Contributor
timestamp: January 01, 2018, 08:32:44 pm
content: I've revised my circuit, will this one work?

author: Nusa
author_rank: Super Contributor
timestamp: January 01, 2018, 08:54:02 pm
content: Is ground referenced to the inputs in any way? If not, you don't have a complete circuit.

author: THATguy
author_rank: Regular Contributor
timestamp: January 02, 2018, 05:12:32 am
content: Not sure how to connect it up except to copy that other guys circuit.I was hoping there would be a simpler way.Does this work?Providing switches J & K cannot be switched on at the same time.

author: Nusa
author_rank: Super Contributor
timestamp: January 02, 2018, 06:31:38 am
content: Does it work to do what? What's your goal here? Is it to charge the battery?I didn't watch the whole video, but seems like you've ignored the bridge rectifier after the transformer in whatever you're trying to copy. The circuit is getting DC input, not AC.https://en.wikipedia.org/wiki/Diode_bridgeThe only capacitor in the video circuit is just to smooth the rectified DC input a bit.As for ground symbols, that's a shorthand way of saying they're all connected to the same place. Treat it exactly as if there were a solid wire between all the ground symbols.

author: Ian.M
author_rank: Super Contributor
timestamp: January 02, 2018, 06:51:30 am
content: First you need to define 'work' in the context of whatever you are trying to do. If you don't state the purpose of the circuit, no-one else can tell you if it 'works' for any purpose except converting electrical energy into low grade heat.The video you linked is full of crap. e.g:* A 12V secondary transformer feeding a bridge rectifier and capacitor will give closer to 16V DC.* A PP3 9V alkaline battery typically has a capacity of around 600mAH. A current of 6uA would take 100000 hours to fully charge it. That's over 11 years, so it probably wont even keep up with the self-discharge of the battery!* The relay doesn't need a back-EMF protection diode as the circuit feeding it is never broken.* Putting mains and isolated low voltage circuits on two poles of the same switch is unsafe, unless the switch is built from individual mains rated, sealed microswitches, one for each pole, with their actuator and mounting frame grounded, or is otherwise of a construction that under all possible failure modes short of total physical destruction, retains reinforced insulation between the poles.

author: batteksystem
author_rank: Regular Contributor
timestamp: January 02, 2018, 10:46:18 am
content: Quote from: THATguy on January 02, 2018, 05:12:32 amIf you just hope for quick answer, and do not understand what you have drawn, then I doubt you would be able to build any circuit, even with a 100% working schematic.

author: THATguy
author_rank: Regular Contributor
timestamp: January 02, 2018, 07:05:54 pm
content: Sorry for my confusing description.