## transformer core material

Started by in sci.electronics.basics3 years 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 in sci.electronics.basics3 years 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 in sci.electronics.basics3 years 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 in sci.electronics.basics3 years 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 in sci.electronics.basics3 years 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?

## Audio Attenuator

Started by in sci.electronics.basics3 years ago 6 replies

Hi guys, I have an old vintage HP audio osciallator which I want to use for some experimentation to get more practice in electronics. Its...

Hi guys, I have an old vintage HP audio osciallator which I want to use for some experimentation to get more practice in electronics. Its output is continually variable between 4 and 20 volts. Problem is, for some experiments I have in mind, I need it to output only between 1mV and 10mV. The oscailator's output impedance is 600 ohms it states. Can anyone suggest a simple passive attenuator...

## It May Be Time For A Coure In Basic Electroics

Started by in sci.electronics.basics3 years ago 1 reply

Yup, I have seen them teach things wrong for decades. The students don't grasp the ideas the way they do it. Who agrees ?

Yup, I have seen them teach things wrong for decades. The students don't grasp the ideas the way they do it. Who agrees ?

## Automated Power Cycle

Started by in sci.electronics.basics3 years ago 3 replies

Hey all, Has anyone used or installed a 120volt power relay that would allow for a 23 hour 59 minute on time and a 1 minute off time that...

Hey all, Has anyone used or installed a 120volt power relay that would allow for a 23 hour 59 minute on time and a 1 minute off time that would then repeat the cycle?? The desire would be to have a remote device do a daily reboot without human intervention. I know I can build one to do the job but I was wondering if someone knows of a device that would be off the shelf available to ju...

## Non-thermal microwave injuries

Started by in sci.electronics.basics3 years ago 3 replies

When the first reports of diplomats at the American Havana Embassy falling ill were caused by microwave injuries it seemd quite implausible. Now...

When the first reports of diplomats at the American Havana Embassy falling ill were caused by microwave injuries it seemd quite implausible. Now it seems more incidents have emerged, and the Frey effect, discovered in the early 1960's, at least indirectly supports the idea microwaves can have lasting non- thermal effects on humans. The article is at https://www.nytimes.com/2020/10/19/us/polit...

## Help required with 22V10 - Using a pin as Input an Output

Started by in sci.electronics.basics4 years ago 1 reply

I'm having problems with the SDA part of an IIC implementation in a AMD 22V= 10C (not from China!). I can Output data, to the SDA output, but I'm...

I'm having problems with the SDA part of an IIC implementation in a AMD 22V= 10C (not from China!). I can Output data, to the SDA output, but I'm not ab= le to read the SDA input! My CUPL equations, as a whole, compile OK using W= INCUPL and the .JED file programs OK. These are the intermediate declarations: FCD7=C2=A0=C2=A0=3D !nPFC & A7 & A6 & !A5 & A4 & !A3 & A2 & A1 & A0; SCLH=C2=A0...