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Ringing test To check transformers. The transformer must be removed first. To do this you apply a small!!! pulse across one winding and observe the amount of ringing. This will show a lot of ringing

Hi Leo, I think Bert is talking about the little transformer use din the pre-regulator circuit, rather than the big primary transformer. Indeed the pre-regulator transformer is a common weak point. I

The other day, I was given an SR760, presumably with a faulty CRT. I don't know where else to go for help, so I'm turning to you guys and girls. If someone can recommend a place to seek help, please

A possibly clean one-shot solution for replacing these pesky filter caps is on my mind. I was given a non operational Tek 465 just before i retired. The +55VDC rail is sitting at 41.6VDC, it is the

FWIW I have also built a "silent" compressor. Well, I had to, after switching that monster from the DIY store on the first time I knew I wouldn't put up with that racket. I took a refrigeration

On Sat, 28 Jul 2018 08:26:52 -0700, you wrote: If you have a dual channel scope, preferably one that does storage, or a digital scope, or a logic analyzer, then you're looking for a coincidence of the

I've never found it to be a problem, I just swap tips as needed for different temperatures and situations. Go look for used, of course. For me, it's NEVER someone else's money unless I get something

Eric I'm curious on your air compressor since the metcal seed 90 PSI can you contact me off group and tell me how you build it thanks [email protected]> wrote:

495P A54 Memory Board Troubleshooting: continued At some risk of wearing out my welcome here with multiple posts on this topic, however, I am seeing this instrument and its various circuits for the

Hi, I have a 7L12 and a 7L14 and I made my self the same question. With two prescalers and two counters is possible to make a circuit and write in the readout system. Anyway I?m searching for a TR502

I used to feel the same regarding temperature adjustment, but with the newer high wattage PID controlled irons I haven't found it necessary to mess with temperature much at all, even though my main

I would like two boards please. I'm good in QRZ W0MPM

On Fri, 27 Jul 2018 21:25:23 -0700, you wrote: You can sometimes find Metcal power supplies at hamfests. You can find various varieties, the older ones are least expensive. The newer ones may drive

Oops, got the URL wrong! http://w140.com/tekwiki/wiki/2445_PSU_Repairs

I have created a page on the TekWiki for this sort of info. http://w140.com/tekwiki/wiki/224x_PSU_Repairs If anyone has any helpful info, this would be a great place to add it. If you can't add it,

Thanks for the answer Chris You made things a bit clearer. I don't need accuracy, just stability. I do have a frequency source that I can use to tune into the frequency I'm after but then I would like

Barry, Can you please send me a pdf of the PCB? It will be easier for me to get them fabricated in VU Land locally. Kind regards and 73, Sudipta Ghose VU2UT

Hi Barry, I am not sure that you receive my previous e-mail, so I copy the text hereunder. Great, thank you. When I live in Miami, my preferred carrier was USPS. Prices was a that time quite

Hi Bert, the "ringing test on the transformer", is that a way of testing the windings of the primary transformer? Do you have any information about this test? Because my scope is running fine on an

I mostly adjust the temperature for specific tasks rather than for more power (I agree that is not a good workaround anyway). For example to tin enamel wire I need to crank it up so the laquer burns