Everything for Electronics

Unanswered Questions

Troubleshooting January 2012

How does one replace a spider IC?

Enugu, Enugu

Self-Powered Current Switch January 2012

I would like to know how to build a self-powered currect switch to monitor a lamp pole light. I need it to output an open or closed contact, so I can sense if there is current or not.

The light pole voltage is 120V at a range of 1A-10A. Anything above 200-500 ma current is on or closed contact. Otherwise, no current, open contact. I need it as small as possible and over-voltage and over-current protected.

Any help out there?

Christopher LeFrois
Lincoln, NE

Power Supply For Fluke 8050A and 8600A January 2012

I have a couple of older Fluke 8050A and 8600A multimeters that were outfitted with battery options. The batteries are long gone and I never really used them anyway. I would like to use them as bench only meters and reconfigure them to a non-battery type supply. Does anyone have an internal power supply plan that I could use in these meters without drilling holes in the cases and cutting up traces on the circuit boards? Something using capacitors, diodes, etc., that would fit into the battery area and plug directly into the battery connections.

David Asselin
Saint-Lambert, Quebec

Audio Electronics February 2012

I want to construct an audio amplifier which will have a USB input for audio songs. Previously, I have constructed many audio systems, but now I want to add USB input where I can get songs just by pluging in a USB stick or memory card.

Sohail Anjum
Islamabad, Pakistan

Wire Termination February 2012

What connectors seem to be the choice of electronics hobbyists when assembling electronics projects on perf board? Also, is there a standard regarding the spacing of the "perfs" on the boards?

Don Henderson
Tewksbury, MA

Sensor Cable March 2012

I'm looking for a cable that sends an input to the PLC when touched. Any suggestions?

Denver, CO

Heart Rate Monitor March 2012

I need a circuit that will read a person's heart rate by gripping two electrodes.

I have an "older" treadmill and find the clip-on ear heart rate monitor too unreliable. The newer treadmills use hand grips to measure pulse rate.

The circuit should use readily available components such as a digital voltmeter as a readout device. Also, the cost should be low (there are commercial devices costing over a $100).

F. Muratore
Long Island, NY

USB Picture Ornament Not Installing May 2012

I have a Fourstar Group Vuescape 1.5" Digital Display Ornament, Model 11010025. It’s supposed to have a built-in USB driver and application that loads when plugged into a computer‘s USB port. However, when it’s plugged in, the "Device Driver Not Successfully Installed" message displays. When researched, Code 43 is identified. Fourstar Group says the driver and program are internal and unavailable as a separate download. Since the ornament is not recognized, it does not show up as an external drive to find and launch the application as Fourstar Group suggested. Is there a way to force installation of a similar driver for a similar device, if I can find one (common type of 1.5" digital display)? I’ve tried on different computers and operating systems, so it should be generic.

San Jose, CA

BJT Transistors June 2012

How do you measure BJT hybrid parameters HF, HI, HO, and HR?

Jose Perez
Guaynabo, PR

Solar LED Illumination June 2012

For several years, we have used a solar yellow LED deck lamp as a "Welcome Light" for our camper — the 12V "patio light" is just too bright, and ruins the moment. I would like to have a simple NiMH/NiCad amber LED light that would be charged via solar, but also from the 12V onboard power when available. I also need an on/off switch for the LED.

# 6121
William Hogan
West Lafayette, IN

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