Orange super-bright LEDs

Started by Mr. Man-wai Chang in sci.electronics.basics2 months ago 33 replies

Are they true orange LEDs? Is "orange" the same as "amber"

Are they true orange LEDs? Is "orange" the same as "amber"


help identifying damaged IC

Started by Gareth in sci.electronics.basics2 months ago 2 replies

I'm trying to identify a damaged IC in my son's radio controlled car. It's SO-8 package, I think it's an H Bridge. The part number starts...

I'm trying to identify a damaged IC in my son's radio controlled car. It's SO-8 package, I think it's an H Bridge. The part number starts "CP21" but the last characters are not legible. There is a photo here: http://gareth.awardspace.co.uk Pins 1 & 2 are logic level controls for forwards and backwards. Pins 3 & 4 go to the battery -ve & +ve terminals respectively. Pins 5 & 6 ...


Soldering to Phosphor-Bronze

Started by Searcher7 in sci.electronics.basics2 months ago 3 replies

Are there any guidelines for soldering 18g leads to Phosphor-Bronze? I assume that I should rough the Phosphor-Bronze up with some fine sand...

Are there any guidelines for soldering 18g leads to Phosphor-Bronze? I assume that I should rough the Phosphor-Bronze up with some fine sand paper before soldering the wires to it, but I'm still concerned about the connection being. (I'm using Phosphor-Bronze for it's flexibility and electrical conductivity). Thanks. Darren Harris Staten Island, New York.


Something others may find useful (mains leds and dimmers)

Started by default in sci.electronics.basics2 months ago 12 replies

I got some el-cheapo "Circuit On Board" style retro looking clear 4 watt led lamps to replace the 4 - 40 watt "designer" bulbs in the overhead...

I got some el-cheapo "Circuit On Board" style retro looking clear 4 watt led lamps to replace the 4 - 40 watt "designer" bulbs in the overhead light in my bedroom. 160 watts down to 16 watts... But the light is too bright most of the time. They are supposed to be dimmable LEDs, but that probably depends more on the dimmer than the led from my experience with other bulbs around the house. ...


Here's what I know about negative feedback

Started by chrisv in sci.electronics.basics2 months ago 16 replies

I have a BSEE. Negative feedback has many benefits, but "maintaining stability" is not one of them. Just the opposite, in fact. Agree or not?

I have a BSEE. Negative feedback has many benefits, but "maintaining stability" is not one of them. Just the opposite, in fact. Agree or not?


Fishing Security Camera Wire Connectors Through A Wall

Started by Bret Cahill in sci.electronics.basics2 months ago 21 replies

The power and coaxial connectors seem to be hanging up just below the attic. The wall has insulation in it but it may be the hole in the first...

The power and coaxial connectors seem to be hanging up just below the attic. The wall has insulation in it but it may be the hole in the first cross piece between the studs is smaller than the attic hole. Sometimes you can get around coaxial cable with just regular wire, at least for short distances in some situations. Is this true for HD security camera wire? Will cutting the connectors o...


Tee Hee

Started by Jim Thompson in sci.electronics.basics2 months ago

Tee Hee... ...Jim Thompson -- | James E.Thompson | mens ...

Tee Hee... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ


Baffling simple circuit

Started by Bob Engelhardt in sci.electronics.basics2 months ago 15 replies

https://i.imgur.com/OWbZIrH.jpg The circuit monitors a battery & when its voltage is above an adjustable threshold, it closes a relay. When...

https://i.imgur.com/OWbZIrH.jpg The circuit monitors a battery & when its voltage is above an adjustable threshold, it closes a relay. When the voltage drops below the threshold, it turns off and latches off (the feedback diode). What's baffling is that it works for a second or 2 and turns off. Particularly baffling is when I measure the voltage at the arrow, it stays on. The voltm...


A circuit that outputs 3V when there was a pulse input

Started by Mr. Man-wai Chang in sci.electronics.basics2 months ago 12 replies

Is there a simple circuit that does that? -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ ...

Is there a simple circuit that does that? -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ Simplicity is Beauty! /( _ )\ May the Force and farces be with you! ^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3 ???! ???! ???! ???! ???! ???! ????? (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu


Generator harmonics question(s)

Started by Anonymous in sci.electronics.basics2 months ago 3 replies

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I...

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I saw the major 60 cycle waveform and then a lot of smaller waveforms at higher frequencies. I was told that these harmonics were typical of small generators. Today I am replacing the voltage regulator on a small generator and adjusting the governo...


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