DC motor supply

Started by Bob Engelhardt in sci.electronics.basics16 hours ago 5 replies

I have a 24v DC motor that I'm using with a PWM controller supplied by a 24v SMPS. I want to be able to briefly switch the motor to 48v with a...

I have a 24v DC motor that I'm using with a PWM controller supplied by a 24v SMPS. I want to be able to briefly switch the motor to 48v with a relay. I don't have a 48v supply, but I do have a 24v transformer & bridge. I know that the following will give me the 48v, and I think that the Motor Control will be OK with it. But I'd like to know if I'm missing something. The relay will d...


DC relay coil

Started by Bob Engelhardt in sci.electronics.basics1 day ago 5 replies

I have a DC relay with the coil connections marked "+" & "-". Does it matter? The relay operates with either polarity so there is no internal...

I have a DC relay with the coil connections marked "+" & "-". Does it matter? The relay operates with either polarity so there is no internal flyback diode. It's a 24v, 33ma coil for those who want to know. Thanks, Bob


Semiconductor manufacturing locations

Started by Michael Darrett in sci.electronics.basics4 days ago 4 replies

Hello, In light of the cargo ship debacle in the Pacific, I am trying to determine which companies still manufacture semiconductors in the US...

Hello, In light of the cargo ship debacle in the Pacific, I am trying to determine which companies still manufacture semiconductors in the US and Europe. I found these: https://www.thomasnet.com/articles/top-suppliers/semiconductor-suppliers-manufacturers/ https://www.bisinfotech.com/top-ten-transistor-manufacturers/ Apparently Analog Devices is headquartered in the US but it's unclea...


anti-music "remote control"

Started by Eli the Bearded in sci.electronics.basics2 weeks ago 1 reply

https://www.vice.com/en/article/jg8wnb/square-dancing-noise-china Residents who are fed up with the noise from China's ubiquitous ...

https://www.vice.com/en/article/jg8wnb/square-dancing-noise-china Residents who are fed up with the noise from China's ubiquitous "dancing grannies" are resorting to a special device that could mess with the speakers that blast out loud music. They use an infrared remote control dubbed "anti-square dancing magical device" to silence the noisy dancing troupes that have ...


transformer core material

Started by Tom Del Rosso in sci.electronics.basics1 month ago 29 replies

AIUI you use iron cores for low frequency and ferrite for high frequency because ferrite doesn't get magnetized, so why couldn't aluminum do the...

AIUI you use iron cores for low frequency and ferrite for high frequency because ferrite doesn't get magnetized, so why couldn't aluminum do the same? -- Defund the Thought Police


Confirmation needed

Started by Bob Engelhardt in sci.electronics.basics2 months ago 5 replies

I'm going to make a 12v DC power supply with a linear reg. I will half-wave rectify 12v AC and have a smoothing cap. The load is only...

I'm going to make a 12v DC power supply with a linear reg. I will half-wave rectify 12v AC and have a smoothing cap. The load is only 10ma. So: 12v RMS is 17v peak, minus the diode drop of 0.7 is 16.3v peak. Using a 47uF cap, the ripple will be 3.5v p-p. So the min voltage into the regulator will be 16.3-3.5 = 12.8. Ripple calculated from Vpp = i/fC (.010/(60*47e-6). Am I missing ...


Solar charger

Started by AK in sci.electronics.basics2 months ago 10 replies

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still...

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still charging. Here are some specs for the charger. Rated power output = 5W Operating power voltage = 18V Operating power current = .33A Trickle charging current = .2A Floating charging Voltage = 13.8 Overcharge Protection Voltage = 14.1 Voltage At what ...


2mm Pitch connectors.

Started by amdx in sci.electronics.basics2 months ago 1 reply

I was just tired of seeing the 1.8MM pitch connector subject line, so I changed it. ...

I was just tired of seeing the 1.8MM pitch connector subject line, so I changed it.                                                         Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus


1.8mm Pitch Connectors

Started by Bret Cahill in sci.electronics.basics4 months ago 3 replies

2.54mm connectors are easy to find. Is there anything off the shelf for 1.8mm?

2.54mm connectors are easy to find. Is there anything off the shelf for 1.8mm?


Toyoda Is Playing the Industry Like A Vegas Poker Chip

Started by Bret Cahill in sci.electronics.basics4 months ago

Toyota has thousands of patents on solid state batteries. Japanese material scientists are second to none. This dog and pony show needs to...

Toyota has thousands of patents on solid state batteries. Japanese material scientists are second to none. This dog and pony show needs to come to an end. https://www.wsj.com/articles/toyotas-chief-says-electric-vehicles-are-overhyped-11608196665


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