The dim traces on the vertical part of a square wave is normal. This is due to the speed which they are "drawn" on the CRT face. The faster the rise time of the trace, the dimmer the trace will be. Th

Where I used to work, we used optocouplers to Isolate TELCO ring from our circuit and detect ring. We found that as the opto aged the ability of the photo device to see the emitter decreased. We repla

CRxx indicates "Crystal Rectifier" with a sequence number. Crystal Rectifiers are diodes. CR17 would be the seventeenth diode inserted into the schematic. Due to revisions and other reasons all the se

You have one what?? Glenn

What did Tom recommend? Glenn

Could photos that have been posted for over a predetermined time be resized? This should free up storage area and retain the photos for history. If the photo author is posted with the photo, and someo

IPC J-STD-001G states: 7.4 Installation of Surface Mount Components Surface mounted device leads or components shall not [D1D2D3] be pressed down against the PCB land or other mating surface during th

Crazy glue will not withstand soldering temperature. When heated to soldering temperature, it gives off vapors that probably are not good to breath. IPC-SM-817A address adhesives for SM parts. This do

Those are called Mod-pots, for modular pots. At one time you could get a kit to assemble these as you needed, for prototyping and repair. Now the kits are no longer available and the pots are assemble

My take on this after replacing thousands of surface mount electrolytic capacitors is replace them all when you get a new to you device that is more than ten or so years old. Switchers are harder on e

Ensure that the silicon sealer does NOT cure with acetic acid. Use silicone sealer that cures with alcohol. If it smells like vinegar do not use it on electronics. Glenn

Is a 7D01 of any value or just good as a source of parts for other plugins? Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA

How many do you need? Glenn

It is not crazy when you understand the reason for the removal. When gold plated material is soldered with tin bearing solder and the dissolved gold is greater than 3-4% of the total of the solder, go

If there is an EMI filter at the mains input, that is probably the problem. The capacitors to ground can leak enough to trip the GFI. If the filter is not a sealed assembly, replace the capacitors wit

What does this reference? You forgot to include enough of what you are referring to for us to understand. Glenn

In soldering class while in the Navy, we were taught that solder was to cleaned with alcohol before use. We would take a gauze pad and get it wet from the alcohol pump bottle on the bench and pull a l

A quick search shows Parts Express has 96% Sn/ 4% Ag solder. The cost is $44.75 for 1/2 pound. MSDS shows melting point is 183C the same a Eutectic solder. Looks suspicious to me as this is made in Ti

A quick search shows Parts Express has 96% Sn/ 4% Ag solder. The cost is $44.75 for 1/2 pound. MSDS shows melting point is 183C the same a Eutectic solder. Looks suspicious to me as this is made in Ti

If you are not careful in removing a lead from the ceramic terminal strip, the silver metalization is easily removed from the ceramic. Glenn