Thermionic valve projects?

Started by Peter Percival in sci.electronics.basics3 years 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


Rope Light Circuit

Started by Bret Cahill in sci.electronics.basics1 year ago 4 replies

The sealed-up-in-plastic power supply comes with the plug, 110v U.S. or 220= v EU. On a 110 v AC U. S. plug the output appears to be 110 v DC...

The sealed-up-in-plastic power supply comes with the plug, 110v U.S. or 220= v EU. On a 110 v AC U. S. plug the output appears to be 110 v DC and 220 AC on a = volt meter. The LED part of the rope light plugs into the output of the power supply. = It looks like two rails go the length of the LED section which can be cut e= very meter at a marked location. Some LEDs can burn out while t...


Power supply trips CU

Started by RobH in sci.electronics.basics1 year ago 15 replies

I bought a 12volt 8.5amp TDK Lambda power supply from Radio Spares to replace a Mean Well 12v 8.5a supply which had failed after 3...

I bought a 12volt 8.5amp TDK Lambda power supply from Radio Spares to replace a Mean Well 12v 8.5a supply which had failed after 3 years. https://uk.rs-online.com/web/p/embedded-switch-mode-power-supplies-smps/8139099/?sra=pstk I connected it up to a 3 pin plug with a 13A fuse. When I plugged it in to an extension socket, which had a 13amp fuse, to check the output voltage, it tripped ...


Really Basic Power On Question

Started by Bret Cahill in sci.electronics.basics11 months ago 1 reply

This must be a really really common problem and the only reason it is diffi= cult to find on youtube is the wrong search terms: If a device...

This must be a really really common problem and the only reason it is diffi= cult to find on youtube is the wrong search terms: If a device has a power on button latch switch and you want it to turn on a= nd off like a light bulb, i. e., when the power supply is plugged in or a r= elay connects the power, or for solar, when the sun comes up, is it a commo= n solution to run a wire from th...


PSU for valves

Started by Peter in sci.electronics.basics11 months ago 12 replies

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...


Confirmation needed

Started by Bob Engelhardt in sci.electronics.basics5 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 ...