Two diode vs four diode rectification

Started by Peter Percival in sci.electronics.basics8 months ago 31 replies

What is the advantage of a four diode bridge full-wave rectifier over a two diode full-wave rectifier. There must be some, else why accept the...

What is the advantage of a four diode bridge full-wave rectifier over a two diode full-wave rectifier. There must be some, else why accept the extra cost? -- "He who will not reason is a bigot; he who cannot is a fool; he who dares not is a slave." - Sir William Drummond


Current vs. wire gauge

Started by Peter Percival in sci.electronics.basics8 months ago 7 replies

What current can 18AWG wire carry? And, more usefully, is there a table somewhere giving this info for all the usual gauges?

What current can 18AWG wire carry? And, more usefully, is there a table somewhere giving this info for all the usual gauges?


The Tardigrades

Started by Banders in sci.electronics.basics8 months ago 1 reply

We can't just leave them there to die.

We can't just leave them there to die.


Rebuild computer speakers

Started by AK in sci.electronics.basics8 months ago 2 replies

I bought some Inland Pro Sound 2000 speakers from a thrift store. It is an amplified system putting out about 7 watts. They sound pretty...

I bought some Inland Pro Sound 2000 speakers from a thrift store. It is an amplified system putting out about 7 watts. They sound pretty poor. I remember making my own 8 ohm speakers years ago using a woofer, midrange, tweeter, and a cross-over network. Can I do that also with this system? Thanks.


Teaching Transistor Theory

Started by Cursitor Doom in sci.electronics.basics8 months ago 19 replies

I've just had a pedagogic revelation! Here it is: Transistor theory is much more effectively taught if explained as a *discovery* (which it...

I've just had a pedagogic revelation! Here it is: Transistor theory is much more effectively taught if explained as a *discovery* (which it was) than as an invention (which it never was). All these decades I've been wrestling with this conundrum and all it took to clear things up was a handful of these amazing mushrooms. Yay! :-D Okay, I was joking. But seriously, think about it. The co...


Thermionic valve projects?

Started by Peter Percival in sci.electronics.basics8 months ago 22 replies

Here https://www.rapidonline.com/valves there are a variety of thermionic valves. Where can I find projects that utilize them? I'll also...

Here https://www.rapidonline.com/valves there are a variety of thermionic valves. Where can I find projects that utilize them? I'll also need a HT power supply. Any thoughts? -- "He who will not reason is a bigot; he who cannot is a fool; he who dares not is a slave." - Sir William Drummond


Soldering paste

Started by AK in sci.electronics.basics8 months ago 10 replies

I recently received this and am learning about what applications it is good for. https://imgur.com/3pGTm0a I put a small amount on a project...

I recently received this and am learning about what applications it is good for. https://imgur.com/3pGTm0a I put a small amount on a project board and the solder seemed to adhere better. I am using up some old RS solder that has the paste already in it, though it may have dried out quite a bit. What situations would be good to use the paste in? Thanks, Andy


Replacement NiMh battery for small solar light

Started by AK in sci.electronics.basics8 months ago 1 reply

I replaced a 600 Mah NiMh battery in a small solar light with a 2300 Mah since I had no 600 Mah hr batteries in my stock. It worked great for...

I replaced a 600 Mah NiMh battery in a small solar light with a 2300 Mah since I had no 600 Mah hr batteries in my stock. It worked great for about a week, but then the light started blinking when it should be on steadily. Is it because the solar panel can not charge a battery with 4 times the capacity? Andy


Dropbox test

Started by John Larkin in sci.electronics.basics9 months ago 4 replies

https://www.dropbox.com/sh/lx4vkcno5thghc5/AAAQ0-_kBJz86FkV2-MN5Mxea?dl=0 Can non-Dropbox members open this folder and sub-folder and see...

https://www.dropbox.com/sh/lx4vkcno5thghc5/AAAQ0-_kBJz86FkV2-MN5Mxea?dl=0 Can non-Dropbox members open this folder and sub-folder and see the files? -- John Larkin Highland Technology, Inc lunatic fringe electronics


Connection from camera to TV

Started by AK in sci.electronics.basics9 months ago 9 replies

Due to a recent theft, I want to get this B/W security camera going. At one time, I had the output going to my TV. The one pic shows the...

Due to a recent theft, I want to get this B/W security camera going. At one time, I had the output going to my TV. The one pic shows the connector at the other end of the camera cabling. My TV has a video input using a RCA connector. Is there some adaptor I need? https://imgur.com/QDxOKBI https://imgur.com/1I6SPe4


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