Servo motor recommendation sought

Started by D.M. Procida in sci.electronics.basics5 months ago 2 replies

For my plotter project I have experimented with a variety of different servo motors. Very cheap analog micro servos work very well (I have...

For my plotter project I have experimented with a variety of different servo motors. Very cheap analog micro servos work very well (I have been using Tower Pro SG90s), as you can see from the images on the site, but digital versions do not, because they are too twitchy. I'd like to try with some different digital (more expensive) servo motors to see if the


Misusing a transformer

Started by david eather in sci.electronics.basics5 months ago 6 replies

Just a sanity check if you don't mind. I have a 230v to 30v 1amp 50Hz transformer - is there anything wrong with plugging that into 115v 60Hz...

Just a sanity check if you don't mind. I have a 230v to 30v 1amp 50Hz transformer - is there anything wrong with plugging that into 115v 60Hz to get 15v 1 amp out?


Diode test and identify

Started by Steve Wolf in sci.electronics.basics5 months ago 8 replies

trying to fix AC/DC power plug. I have a Diode that says: GW327 SR560 I THINK this is a Schottkty Diode. Setting meter to Diode test,...

trying to fix AC/DC power plug. I have a Diode that says: GW327 SR560 I THINK this is a Schottkty Diode. Setting meter to Diode test, Im getting, 1.71 Forward and Reverse .171. Normally on diode I know you should get 1 on reverse Are these readings allowable or is the Diode Bad. Thanks.


Harmon divider 10:1 and 100:1

Started by amdx in sci.electronics.basics6 months ago 3 replies

Just found this neat method to make 10:1 voltage dividers. Not as important now that you can get such precision resistors, but with this you...

Just found this neat method to make 10:1 voltage dividers. Not as important now that you can get such precision resistors, but with this you don't need them. Also measurable on a single voltage range so no worry about another attenuator in your meter. Again not so important with modern meters. I had to read it twice to understand it, maybe you will do better. > http://conradhoffman.co


Original Equipment Needs To Shut Down Or Alert If the Circuitry Is Altered In Any Way

Started by Bret Cahill in sci.electronics.basics6 months ago 7 replies

Temperature might be one way of doing it. Any subsequent history of soldering would flag a problem. Board watching cameras might be the...

Temperature might be one way of doing it. Any subsequent history of soldering would flag a problem. Board watching cameras might be the easiest cheapest way to preserve the integrity of a device. https://www.wired.com/story/plant-spy-chips-hardware-supermicro-cheap-proof-of-concept/


45v out of a bridge rectifier, what AV voltage goes in?

Started by Peter Percival in sci.electronics.basics6 months ago 20 replies

If want to get 45v/2amps out of a bridge rectifier, what AV voltage goes in? -- "He who will not reason is a bigot; he who cannot is a...

If want to get 45v/2amps out of a bridge rectifier, what AV voltage goes in? -- "He who will not reason is a bigot; he who cannot is a fool; he who dares not is a slave." - Sir William Drummond


It Wouldn't Take Much Affer Marketry Circuitry To Mitigate This Problem

Started by Bret Cahill in sci.electronics.basics6 months ago 1 reply

No need to spend $5K on a Powerwall. Home owners wif grid ties should be able to flip a switch when the utility goes AWOL. Then they can...

No need to spend $5K on a Powerwall. Home owners wif grid ties should be able to flip a switch when the utility goes AWOL. Then they can refreeze the cheese & meat in the refrigerator and charge up some smart devices when the sun is shining. Gavin, are you listening? Any prof at any EE dept will tell you this is low hanging fruit. https://news.bloombergenvironment.com/environment-and-en...


Isolation transformer?

Started by Bob Engelhardt in sci.electronics.basics6 months ago 19 replies

I was looking for a 120-120 isolation transformer on eBay and I kept finding 120-240/480 transformers. There are 2 secondaries on these...

I was looking for a 120-120 isolation transformer on eBay and I kept finding 120-240/480 transformers. There are 2 secondaries on these (connect in parallel or series). It occurred to me that I could use one of these as a 120-120 by using one secondary as input and the other secondary as output. I know that this is theoretically possible, but are there practical reasons why it wouldn'...


Colpitts oscillator

Started by riccardo manfrin in sci.electronics.basics6 months ago 5 replies

Hi, I'm following instructions here (https://www.wikiwand.com/en/Colpitts_oscillator#/Practical_example) to build a discrete components above...

Hi, I'm following instructions here (https://www.wikiwand.com/en/Colpitts_oscillator#/Practical_example) to build a discrete components above MHz oscillator. I could not find a 150nH inductance so I used one I found on spare components, which has I think rather larger inductance. The circuit appear to be working well and outputs around 10MHz, but in order to see the frequency


Wanted: A 'joule thief' style circuit design...

Started by ~misfit~ in sci.electronics.basics6 months ago 15 replies

... that I can use to drain alkaline cells and push the 'charge' into either a lithium-Ion cell (for a flashlight), a phone or a powerbank. I...

... that I can use to drain alkaline cells and push the 'charge' into either a lithium-Ion cell (for a flashlight), a phone or a powerbank. I have a combined wireless doorbell - inside/outside thermometer that I quite like. Unfortunately it won't run on NiMH cells and only uses alkalines down to 1.33v. (It's the only thing I have that doesn't run on rechargeable cells.) The sender uses...


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