Archive for February, 2020:

2020-02-21

I found that 100 uH was a good all around value for these solar garden light circuits. But at the time I made these around 2009 the 5252 4 legged chip was uncommon and almost all the garden lights used 2 discrete transistors. I don’t know why they started using the 4 legged 5252 –

(Read More…)

Tags:

2020-02-19 Nobility 15 transistor Radio Repair

2020 Feb 18 – Nobility 15 transistors OTL S/N (?J)29549 I replaced the electrolytic capacitors. The spkr buzzed when I touched the volume control. Nothing from the detector (transistor). It’s unusual. I pulled and tested some IF parts including one of the transistors, no problems found – transistor tested good. I called it a night.

(Read More…)

2020-02-17 I Bid On A Boy’s Radio, Lost

From FB group Vintage Transistor Radios Last week I bid on a boy’s radio, $26 which lasted up until near the end. But as usual I was outbid at the last minute. I think the demand exceeds the supply, and the prices go up too high. Looks like I’ll be getting one that no one

(Read More…)

2020-02-14 Zenith Royal 400 S/N Z551549 Replaced Capacitors, Driver Transformer

Zenith Royal 400 s/n Z551549 I soldered broken orange wire to battery holder. Replaced all four electrolytic capacitors. Silent speaker and nothing from earphone jack. I checked the voltage at the collector of the driver transistor, it was zero. One pin of the driver transformer primary measures 5.8 V, the other pin measured 0. Checked,

(Read More…)

LED Indoor Motion Sensing Lights – Decrease On Time

I bought two of these motion sensing LED lights for my hallway. They have a rechargeable cell that is charged through a micro USB port. To see one inside watch big Clive’s YouTube video – the ebay link to buy them is in his description. The charge lasts for more than a week with frequent

(Read More…)

Tags:

2020-02-08 60 LED Solar Lights Stopped Working – Dead Diode!

From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on the

(Read More…)

2020-02-07 Illegals Contribute Billions In Taxes

SAN DIEGO, CA – JANUARY 26: The Deportation and the separation of families is a major theme in the immigration reform debate. (Photograph by Charles Ommanney/Reportage by Getty Images) Individuals in the U.S. without documentation are believed to contribute $12 billion to local and state taxes, according to a new study.CHARLES OMMANNEY/GETTY IMAGES IMMIGRANTS ILLEGALLY

(Read More…)

2020-02-07 Illegals Contribute Billions In Taxes

SAN DIEGO, CA – JANUARY 26: The Deportation and the separation of families is a major theme in the immigration reform debate. (Photograph by Charles Ommanney/Reportage by Getty Images) Individuals in the U.S. without documentation are believed to contribute $12 billion to local and state taxes, according to a new study.CHARLES OMMANNEY/GETTY IMAGES IMMIGRANTS ILLEGALLY

(Read More…)

2020-02-06 Royal 500H Alignment

From FB group This Zenith Royal 500H radio has the extra 8th transistor for the RF amplifier, so it should have excellent sensitivity and be able to pick up those weak stations. Most of the problems with old radios are with the electrolytic capacitors, but the Zeniths all use the carbon composition resistors and they

(Read More…)

2020-02-02 IC Logo List

This list seems to be mostly integrated circuits, but some semiconductor makers make discrete devices – transistors and diodes, for example Motorola. http://www.siliconinvestigations.com/Logos/logos.htm

© RustyBolt.Info/wordpress
CyberChimps