Electronics Repair

how to calculate the base resistor

please can anyone show me how to calculate the base resistor for an NPN transistor used as a switch. the supply voltage...

5 comments posted 8yrs

posted by fynnashba

5 comments posted 8yrs posted by fynnashba

OT: political glue failure

How do you arrange for a physical letter on a backdrop to a platform used for a political conference? It would have to...

7 comments posted 8yrs

posted by diverse

7 comments posted 8yrs posted by diverse

are there salvagable parts in a Sharp LCD tv

The neighbor has a Sharp LCD tv, small screen size but rather thick profile, with a cracked screen. The glass in front...

27 comments posted 8yrs

posted by timothy42b

27 comments posted 8yrs posted by timothy42b

possible reverse voltage problem

Same new-used car as in the other thread, a 2005 Toyota Solara. Question about possible reverse voltage problem into an...

4 comments posted 8yrs

posted by NONONOmisc07

4 comments posted 8yrs posted by NONONOmisc07

JVC camera output vs. Hauppauge framegrabber input.

Hi, This question concerns a JVC TK-1070U camera connected to a Hauppauge pci framegrabber card. Specs for a similar JV...

5 comments posted 8yrs

posted by petereasthope

5 comments posted 8yrs posted by petereasthope

Can I play MP3?

My new used car from 2005 has a CD that will not play an MP3 CD, but I can buy an adapter that will add an AUX input an...

16 comments posted 8yrs

posted by NONONOmisc07

16 comments posted 8yrs posted by NONONOmisc07

Keyboard missing

On a few occasions when I start my Lenovo T500 laptop the keyboard is unresponsive. With all the Lenovo features, is th...

4 comments posted 8yrs

posted by LenovoLap

4 comments posted 8yrs posted by LenovoLap

Sanyo M2820 Portable Radio/Cassette Recorder Schematic Source

Hi, Does anyone know of a site where I can buy a schematic for a Sanyo model M2820 portable (mono) radio/cassette recor...

7 comments posted 8yrs

posted by jaugustine

7 comments posted 8yrs posted by jaugustine

Q: Universal Power Supply Boards for TV LCD/LED backpanes

Our company is manufacturing backlight signs for restaurants, and our current process involves keeping the original TV...

3 comments posted 8yrs

posted by ingenthron

3 comments posted 8yrs posted by ingenthron

O.K. Aliens Shot Down Meteor?

"While they have not put forward an alternative explanation for the explosi on, outlandish theories in the past have in...

4 comments posted 8yrs

posted by mogulah

4 comments posted 8yrs posted by mogulah

Acculab V-350 scale

Does anybody have schematics or repair info for this scale or one of the other V-series models? My V-350 worked fine wh...

0 comments posted 8yrs

posted by sgoldHAM

0 comments posted 8yrs posted by sgoldHAM

Seriesed battery cells irregular charging

Silly wind-up torch but could be anything using Ni-Cad or ni-Mh multi-cells. LEDs are full bright for a short time afte...

5 comments posted 8yrs

posted by diverse

5 comments posted 8yrs posted by diverse

Re: Drop test confirms Apple totally lied about the glass back on the iPhone 8

He who is Piet said on Tue, 26 Sep 2017 10:16:57 +0200: >> The *material* is the strongest ever. But make it too thin,...

0 comments posted 8yrs

posted by harry

0 comments posted 8yrs posted by harry

Painting a Bakelite radio cabinet

I picked up a RCA Victor 66X2 Radio from 1946-47. It's a very unusual radio. It is AM broadcast band and one Shortwave...

33 comments posted 8yrs

posted by oldschool

33 comments posted 8yrs posted by oldschool

FOR SALE - $475 antique radio for ONLY $65

I bought an antique radio for $475 at an antique store. It was sold as-is, no returns. When I got it home, I plugged it...

7 comments posted 8yrs

posted by sam.markoni3

7 comments posted 8yrs posted by sam.markoni3