Buenos días gente. Me ha entrado un grupo de soldar de la marca Hitbox, modelo Arc200 con varios componentes smd quemados. Los he sustituido todos menos el YY189 porque no lo encuentro en ningún lado. Parece un MOSFET en sop8. Me preguntaba si me podríais ayudar a localizarlo o su equivalente. Muchas gracias por vuestro tiempo.
About 3 days ago I made a post here about a constant current driver to see if it was fine to use. Apparently I made alot of mistakes so I went ahead and did the research and tooks y'alls advice (thanks btw). Hopefully this revision should manage properly.
Here's what I did:
- Swapped the 1V2 zener for a LM4040 2V5 shunt regulator.
- Swapped the N-MOSFET for a 200 hfe BJT.
- Made sure the sense resistor is seeing ~250mV at ~140mA (maximum).
- Removed any components I deemed not needed.
So far the difference between the non-inverting and inverting inputs of the op amp is 18uV ~ 22uV
If you wanna mess with the circuit, here's the link to it.
Also here is the link to the original post.
So I had a powerbank/fan and the lithium decided to inflate. I removed the battery, can I still just plug in the cable and use it as a regular fan?
Hi everyone,
I'm currently scribbling around for a new project and I ran into an issue.
I have 2 voltage supplies as input, where both could be at a different voltage levels. Hence I (to my understanding) I should protect the two sources from each other. Additionally, depending on the voltage level I may need to first put it through a DC-DC converter.
I've come up with the below concept to said things.I used PMOS as high side switches and added a second one to protect against reverse current. To be sure that I don't short anything by accident, I added a small logic such that only one path could be active.
I'm currently not sure whether this concept will work or if there is a better approach to achieve my issue. Any feedback would be greatly appreciated.
Thanks for your help
Hello! I'm currently working on a laser project and was wondering if this circuit was perfectly fine to use, or if I should tweak a few things. The circuit in question is based off of this driver's schematic.
There might be plenty of errors.
Hi everyone,
I have been working on a hobby project: an online simulation game to build electronic circuits and I would be so happy to get some feedback on it! :-)
You can just try the app here (it's free of course): https://chipgrid.io/
I made a short demo video showing how it works. I also created a subreddit, r/Chipgrid, for everyone to share their circuits.
I am so excited to hear your thoughts! :-)
Hi guys!
This is my first time working with these chips and I'm wondering if I connected them correctly?
hello everyone I am new to electronics and we are assigned to make an adjustable power supply with a maximum output of 12v with ventilation. can you please help me what to do? I will list the components and please tell me if it's right or what component should I modify, thank you!
* Step-down transformer (220V to 15V, 2A) – ~60 × 50 × 50 mm, 500g–700g
* Bridge rectifier – 3A/50V+, ~15 × 15 × 6 mm
* 3300µF 35V capacitor – ~16mm diameter × 25mm height
* LM317 voltage regulator – TO-220 package, ~10 × 15 × 4.5 mm
* Heat sink – 3°C/W to 5°C/W, ~60 × 50 × 30 mm
* 0.33µF and 0.1µF ceramic capacitors – 50V+, ~5mm disc diameter
* 10µF and 100µF electrolytic capacitors – 25V+, ~5 × 11 mm
* LED + 1kΩ resistor – 5mm LED + 1/4W resistor
* Fuse + fuse holder – 1A 250V 5×20mm slow-blow + panel holder (~15 × 40 mm)
* IEC AC socket – C14 panel mount, ~27 × 20 mm cutout
* PCB/Perfboard – 2.54mm pitch, ~70 × 90 mm
* Output terminals – Red/Black binding posts, ~11mm mounting diameter
* Hook-up wires – 18 AWG (AC) & 20-22 AWG (DC)
* 1N4007 diodes 2pcs – DO-41 package, ~2.7 × 5.2 mm
* 240 ohms resistor + 68 ohms resistor + 2 kilo ohms potentiometer – 1/4W resistors + 16/24mm body pot with 6mm shaft
* power switch – SPST rocker/toggle 250V/3A+, ~15 × 10 mm cutout
