I made my first working circuit!!!  (THE X-BRIDGE MOTOR DRIVER) - Page 1
Forum section: electronics / beginners

author: krayvonk
author_rank: Regular Contributor
timestamp: March 19, 2020, 08:37:19 am
content: Its working in the simulation and everything!My first motor driver - But to get it working fully, you have to put about 20 LDRs on the more powerful leg of the "X-BRIDGE" and then that should getyou the equivilent of a transistor which runs off a laptop monitor, which can signal from the computer.By putting double the resistance on one side than the other, you get a unsigned to signed convert, and it goes left as well as right. (motor goes in the central crossbar.)Yes, it wastes 75% of the power, but im still proud of it, who cares 1 hour 100% strength to 15 minutes quarter as strong still seems good to me.You can put encoders on it and have a separate feedback circuit., but I figure if your half decent at A.I. you dont even need 'em.(simulation - no sound.) - its pushing the motor right in this case, the ldrs count as fully passing of watts.WOT!

author: Zero999
author_rank: Super Contributor
timestamp: March 19, 2020, 10:29:03 am
content: The circuit makes no sense. Where's the motor? LDRs? Seems like a joke to me.

author: Brumby
author_rank: Unknown
timestamp: March 19, 2020, 10:45:14 am
content: I can see the "shape" of the circuit as being reminiscent of an H-bridge, but the OP hasn't created a bridge driver.This is simply two source circuit with a current flowing through a cross-arm.Nevertheless, this might feel like a great achievement for someone just getting their toes wet. As such, they have successfully put together something that can be simulated - and which will perform pretty much the same if actually constructed.From their reaction, this would seem a big thrill. Let's not dismiss this too easily.

author: krayvonk
author_rank: Regular Contributor
timestamp: March 19, 2020, 10:48:47 am
content: It is a joke, I just wish I could join in real bad, im desperate, but I dont know enough, and it comes out in a jokey little way.Id love to know what even is a bridge driver?My lastest craze is opto-couplers! light isolated circuits is great, I know how transistors are so leaky and all, I think they might be better, could start the next big commotion.

author: Zero999
author_rank: Super Contributor
timestamp: March 19, 2020, 10:58:59 am
content: A simple audio description of what's what on the video would be a good idea. If it's a joke, some smilies would help, as humour doesn't come across through text.The leakage current due to transistors is far too small to worry about in a motor drive circuit.An H-bridge is simply some switches which reverse the current through the motor.https://www.build-electronic-circuits.com/h-bridge/You could make a simple motor controller: forwards, reverse andfreewheelbrake, with a couple of momentary single pole, double throw switches.

author: krayvonk
author_rank: Regular Contributor
timestamp: March 19, 2020, 11:47:15 am
content: Yeh I agree with that.

author: Zero999
author_rank: Super Contributor
timestamp: March 19, 2020, 12:38:22 pm
content: Try this. Note that this circuit is only suitable for small motors. Large motors will draw a huge surge, which can damage the switches and when they're off the motor is short circuited and will pass a high current, until the motor stops turning.

author: krayvonk
author_rank: Regular Contributor
timestamp: March 20, 2020, 08:04:10 am
content: Is that circuit from the 1800's? =)Only takes 2!! relays! thanks for that didnt think of that one! that one would have a buzzing noise, one of the reasons why you go solid state is its more quiet, but then because the motors are brushed it only lost half its noise it makes. gods creatures are all 100% silent basicly, and we know why.