Archive for the ‘Electronic Components’ Category:

2022-05-28 Capacitors: Inferior Or Compromise

Long discussion about the great electrolytic capacitor failure fiasco of 2003. Someone said Dell lost $420 million on in-warranty repairs (we had Optiplex 270 and 280 MoBoards with those bad caps). Tom May One single video of cheap capacitors failing could be an individual with an axe to grind, trying to blemish a company. I

(Read More…)

2022-05-08 Audio 10 Meters Over Laser Beam

I got this idea; instead of using a microphone and preamp at the end of a twisted pair, I would build a microphone, preamp and modulate a red laser with the audio and pick up the audio about ten yards away with a light detector. Notice that it runs on two 2V photovoltaic cells in

(Read More…)

2022-04-20 Philips Ultra Efficient LED Light

Big Clive tears down and reverse engineers a Philips ultra efficient light bulb. It’s 60 watts equivalent but draws only 4 watts. It has a color rendering index of only 80, and costs about ten Pounds UK or about $13 US. This uses 8 filament strings of LEDs and the filament string drops about 200

(Read More…)

2022-03-20 LED Lights May Not Last As Long As Incandescent Lights

The lifetime of incandescent and LED lights is extremely dependent on the temperature at which they run – for incandescents, GE says it’s the inverse of the 7th power of the voltage – the voltage increases and the lifetime decreases. In the case of LEDs the problem is most designs sacrifice thermal management to get

(Read More…)

2022-03-12 Homemade Adjustable Capacitor

Homemade Adjustable Capacitor I read that the 365 pF air variable capacitors are very expensive, $30 or more so I decided to try to build one. It’s not difficult to make an adjustable capacitor out of materials one may have at home. This one does not adjust easily, it’s more of a prototype. I got

(Read More…)

2022-02-27 Caps Wiki – Repairing Electronics

Caps Wiki – a place for you to share your repair notes. I like the idea. I’m wondering if I have the patience to spend the extra time.

2022-02-19 Blinking LEDs Can Look Like They’re On Steady

Blinking LEDs are usually reset by the voltage dropping to zero then coming back on. So if one LED, probably the fastest one, blinks first, all the rest in the series string will be reset, then comeback on again when the fastest one comes back on. So you have essentially a single blinking LED and

(Read More…)

Tags: , ,

2022-01-22 LED Xmas Light String Repair

A string of LED xmas lights had been fritzing on and off, then it finally failed. I had to pull out 4 lights before I found two that were dead. I had to file off the ridge around the base to get them to fit properly into the base. So it’s back working again. It

(Read More…)

Tags: ,

2021-12-22 E.I.A Resistor Color Code

2021-12-06 MP3 Player To FM Radio Link (Mono)

MP3 Player To FM Radio Link (Mono) This circuit allows you to play your MP3 or any stereo audio source into a mono signal for reception on an FM radio. It has no antenna and has a range of a dozen or so meters. It operates off a 6 volt rechargeable Ni-MH battery pack but

(Read More…)

© RustyBolt.Info/wordpress