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 ...

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 ...

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

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?

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...

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 ?

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...

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...

I have an LCR meter which shows the ESR for electrolytic caps, but I have no idea how to interpret this number. How do you know if a cap is...

I have an LCR meter which shows the ESR for electrolytic caps, but I have no idea how to interpret this number. How do you know if a cap is shorted or boardering on that status? I mean, if it gives me a reading of zero Ohms, that's obvious, but what if a small (4.7uF), medium voltage (35V) cap comes up with a reading of, say, 3 Ohms? Is that too low, like I expect, or should it be co...

I thought I'd experiment with a few valve circuits (just for fun). So I'll need an H.T. power supply and I'm looking at...

I thought I'd experiment with a few valve circuits (just for fun). So I'll need an H.T. power supply and I'm looking at this: https://www.timstar.co.uk/el120300-high-tension-ht-power-supply.html It supplies up to 300V at 60mA. My question is, is 60mA sufficient? -- When, once, reference was made to a statesman almost universally recognized as one of the villains of this century, in order...