Apr 2, 2009 · 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?

Aug 25, 2005 · 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.

Sep 8, 2003 · It helps if you have a drill-press mount for the tool, lock it at the desired height and slide the pc board across the drill-press base. It makes a nice, clean cut. This approach works best for trimming off less than 1 1/4" of the pc board, …

Nov 29, 2007 · 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.

Sep 1, 2007 · Printed Circuit Board Coils like this are Already being used on MANY METAL DETECTORS. This isn't anything new. The Main advantage is a Low Internal Capacitance. The main disadvantage is a somewhat high DC resistance.

Nov 8, 2014 · 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.

Jan 24, 2025 · The first circuit appears to have a current limit due to T4's base-emitter resistor of about 0.7V/10Ω = 70mA, which is close to that DC limit. It will also be dissipating about 15W under short-circuit conditions, which may be more than the heatsink can dissipate with exceeding the maximum transistor junction temperature.

May 1, 2008 · If you want to just use household chemicals for etching then you can use the sulfuric acid electrolysis to get the bulk of the copper off the board. Once that is gone and you need a further "scrubbing" etch you can then mix sulfuric acid and hydrogen peroxide to create a solution that will etch the rest directly without electrolysis.

Printed Circuit Board The printed circuit board (PCB) is the basic structure onto which most of the functional components of this kit are installed. It is recommended that the board be fabricated as a nominal 0.062” thick fiberglass substrate, two-sided, with 1-ounce (per square foot) copper layers, and screen printed component information on ...

Feb 16, 2013 · 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 ?