Painting circuit boards | Electronics Forum (Circuits, Projects and ...
2005年8月25日 · This is one I use daily at work, ont everything from terminal strips to PCB's that are being installed in trucks. It is very durable, easy to apply, and can be removed for circuit repair, and is easy to reapply over repaired areas. It is clear, but that is fine, since there is really no reason to try to hide a circuit board anyways.
P1 , P2 , P3 , Meaning - Electronics Forum (Circuits, Projects and ...
2009年4月2日 · I've been searching for a while, for any information on this card and the meaning of P1, P2, P3 that is printed on the circuit board. I'm thinking they mean Pots. If they are pots, how would I connect them, each to ground?
Removing Potting | Electronics Forum (Circuits, Projects and ...
2007年11月26日 · I removed some green stuff a few weeks ago. It was kind of gelatinous, messy stuff. Cut and scoop out as much as I could with a knife and a spoon, until the board came free. Took it outside and used a light wire brush to get most of it clean, a little acetone on the solder side. One power lead was broken off, easy fix.
Circuit Board Dry Transfers... - Electronics Forum (Circuits, Projects ...
2010年7月25日 · Theory, you rub them onto a CC board and etch the excess with Ferric Chloride. I see large sheets of like symbols (all the symbols on a sheet are the same) at Fry's Electronics, and they're quite expensive, and offer little re variety of symbols. Radio Smack hasn't had these things for years (at least within my county, Maricopa, AZ).
Trying To repair transformer board from Husqvarna sewing machine
2015年2月13日 · This board is simply a dual bridge linear power supply. No reverse engineer diagram so can't remember that voltages but one is for the electronics cpu board an the other provides for the motor. Your component is a varistor on the primary of the bridge, It …
PCBs with a PhotoCopier? | Electronics Forum (Circuits, Projects …
2006年7月10日 · This is a board I did last Saturday. Its about 2.5" X 3.25". The traces are thin, almost like drawn with a pencil. I tried a demo of a different layout program, didn't think to change the defaults, everything was in metric (damn brits), so printed it anyway.
Problem with my KEMMPI 1500 Mastertig - Electronics Forum …
2013年2月16日 · I rebuilt the circuit add RZ 103 --35KΩ ????? I removed CNY 65 and chek voltage in point diodes optocupleor --3,5 V dc. I mounted the diode I check current and i see 1,5 mA dc . I energized electrical 12Vdc the circuit MC 14093PBC point 7 gnd 14 + and check signal in point 1 -conector . Here not exist signal . Where i wrong or who is cause ?
Repairing a basic cat toy | Electronics Forum (Circuits, Projects and ...
2014年11月9日 · Please give us a photo of the printed circuit board (PCB) top and bottom, including the the battery wire connection points. There may be components that are polarized (and other items) that will indicate the proper polarity. Take care with the focus so that the "traces" (flat, copper colored paths between components) are visible.
A Simple Washing Machine Repair and a Magical World
2022年6月19日 · All its brains are in a single printed circuit board that includes a surface mount 15mm pressure sensor that connects the level sensing hose. Seems an atmospheric pressure sensor used in automobiles, like this without mounting holes and connector : View attachment 137561 Production cost of the board may be a couple of dollars.
Voltage spikes and dead MOSFETS | Electronics Forum (Circuits, …
2017年2月26日 · Also the PSMN3R9 NMOSFET has an insulated case while the IRF3205 case is not insulated. It is not clear to me which NMOSFETs you are actually using, but if the meatsinks on the printed circuit board are not floating, the IRF3205 will cause a problem. A 68 Ohm gate resistor sounds high for this application, around 10 Ohms would be expected.