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Hi everyone! Its good to be back. I'm sure I missed a lot of stuff while I was away due to various reasons. One of which was because the hobby is a bit expensive. I hope I could get back on track. With that out of the way, I'd like to ask help from the community. I'm building a strobe light...

sold!

NO LONGER FOR SALE is a pair of SoundMagic E10 In-Ear Monitors. These are practically new. I got these in the mail about 12 hours ago and I've only used these for about 5 hours. I'm selling these because I find them very uncomfortable to wear because I have small ears and small ear canals. The...

Today, I was finally able to put together the bench power supply I've been building. But yes, it failed. I'll explain what happened below but here is the schematic of the circuit. Its based on the circuit on the LM317 datasheet with some modifications. When I turned it on for the first time...

all sold

Edit: Topic changed. Okay, so I still have not finished building my CC/CV PSU (thanks to djQUAN for a lot of help) because of some circumstances. Anyway, I've ditched my plan of getting a particular panel meter and just go cheapo. I'm looking at this ammeter. It says that it needs an...

Anyone know where to buy high current springs that can handle at least 10A? If I could get on from China/HK that'd be great so I can save on shipping costs. I'm cheap. :p

Hey guys, If anyone has got lots of free time, can you make a PCB for me? I tried making one with Eagle but I keep screwing up and can't make anything decent. I tried PCBWizard but the autoplacement and autoroute just sucks. Here is the schematic: CC/CV Regulated PS The board is single-sided...

I would like to use the DX buck driver for an Opnext 638nm diode. I've taken a look at the datasheet and the lowest output current I've seen is 300mA. Can this chip go any lower? I would like to test it myself but I do not have the proper equipment for testing for stability.

I got an AMC7135 based driver from Fasttech that is supposed to be set to 700mA. I hooked up a 3W white LED to the driver powered by a single Li-ion cell but its only putting out 225mA. I got the reading by hooking my multimeter in series with the LED. Any ideas why the driver isn't putting out...

Yes, I did search the forum for answers but I am unable to get good ones. I am going to buy a laser from O-like or similar sellers some time later. I am kinda worried about not receiving the laser because the Philippine Postal Corporation is notorious for mail loss/stealing and corruption. If...

Can I hook up two identical transformers in parallel to increase the maximum current draw? The transformers are of the same part number, 220V to 12V, center-tap. I plan to use it in tapped config.

Hey guys, I've done some reading but I still have some things to clear up. I will be making an LM317 based unbranded 3W White LED driver. Considering the dropout voltage and the LED's forward voltage, how much input voltage is needed by the driver? Can I use a red LD test load to test the...

Hey guys, I have a TDK 2.1 speaker system that I use for my PC and it died. I took it apart and found out that the transformer died because its thermal fuse got fried. I am having trouble figuring out the ratings of this transformer. I tested the amp with a small 12-0-12 transformer I have and...

Hey guys. I need help figuring out the pinout of an LM324 IC. I am still a bit of a noob with electronics. I will be using this chip for an audio mixer and it will be powered by SMPS from a pc. Is it correct that I hook up pin 4 to a positive rail and pin 11 to the PSU ground?

Hey guys, I found a laser level from my uncle's pile o' stuff. I didn't see him using this in ages so I thought I'd take it apart :shhh: Here is the entire module. This thing seems to be smaller than those found in pen lasers. All three pins are soldered to the board :thinking: Not...

Happy New Year to everyone here on LPF! :wave::D I am not a man of words so I will keep this short. May we all have a very good year ahead of us. Best of wishes to everyone! Here in my place firecrackers and fireworks aren't banned and everyone can buy whatever they want. It is always very...

Hi guys. I noticed something weird with my Lazerer Stick. When the battery is fully charged I notice that its output is somewhat weaker that when the battery has been used. I noticed this twice already when the battery is freshly charged. I do not have a multimeter to test the battery's voltage...

Hey LPF, Recently superstorm Sandy hit the East Coast of USA and right now a super typhoon is brewing up near our country, the Philippines. Some provinces are hit by very strong winds of up to 210kph. The storm is covering nearly half of the country but luckily my place is still very calm with...

Hey guys, I don't know if this has been observed before or maybe a thread has already been made regarding this. I was watching some stereoscopic 3D videos this evening when I tried to put my greenie in front of the glasses. The cyan lens did not do anything to the laser but the red lens...