Hello Rik / Andy, Thanks for the warning, will ensure the PC is up and running before the PSU is powered! Andy, as you said it would, the DOS box remains once it's started correctly within a DOS box.
Hello Paul, Yes, I put de-coupling caps on all of those, although some are tied together, I went for over kill! Can you temporarily jury rig the driver board right by the FET's and then try shorter g
Hello Paul, back from the pub talk now, wind the damned thing up, and see what happens! ;) Maybe the `scope is giving pessimistic info, you seem to have covered everything else. A box of shrapnel lik
Hello Steve, In hindsight that's how I ended up married, so I should have added "at your own risk" I think ;) -- Best regards, Chris mailto:[email protected]
Hello Peter, Neat, and thank you, but clicking on Andy's exe file is temptingly simple to a PC ignoramous like myself ;) I wonder if a serial port would drive something like this directly, or would a
Hello Andy, Many thanks for that, very pretty! I just need to devise the switch itself now, the PSU has a dual pole mains switch with a magnetic breaker in built. Do you think I am OK leaving that on
Hello Andy, OK, sounds promising, thanks for that. Before splashing out on a new one I'll have a scout around Ebay for something similar at a "bargain price", much appreciated! -- Best regards, Chris
Hello Paul, I am looking at your photo of the LPF. The specs say L1 and L3 should have 52 turns, and L2, the centre one, should have 73 turns. i was unable to get 73 turns on the toroid without windi
Hello Paul, OK, I believe you, I can recognize OCD when I see it ;) Here's a close up of my output transformer from the amp the waveforms were taken from and posted. `Tis now a bit ugly, with a few b
Hello Paul, I just took some photos of one of my spare driver boards that should be detailed enough to copy or peruse usefully. not sure if this type of board is available out there, but I can send y
Hello Nick, Ooops, one of another board proving paper based board and 6kV don't mix.... Try http://www.chriswilson.tv/boardx.zip -- Best regards, Chris mailto:[email protected]
Hello LF'ers, After an expensive accident whereby my home brew antenna change over relay put nearly a kW of RF up the RX antenna jack of my Kenwood TS-590 i want to safely long term test the relay. I
Hello LF'ers I am having no luck with my mini whip antenna, for whatever reason it seems very deaf, so was wondering if I can home brew something like the magic box of tricks for the (expensive IMHO)
Hello Paul. The U3S changes the state of a transistor switch that in turn powers the relays. the DC to DC convertor runs all the time. I guess I need some sort of latching device that stays in the la
Hello LF'ers, If anyone is using PowerSDR, specifically mRX P5 v3.4.9 although I think this will apply to most versions, is the band selection box for LFMF above the "GEN" box, grayed out and not cli
19th April 2018 Hello Ricardo, Thanks for the link, that's almost exactly what i am doing here. I have experimeted and found a 5 watt, 12 volt automotive "festoon" bulb as used in many ineterior ligh
Hello Antonio, Paul is using the same amplifier that I am and the details and schematic can be found on the web site of its designer, W1VD http://www.w1vd.com/137-500-KWTX.html 1 kW amplifier http://
Hello Andy, I have built a heat sinked SSR to control my big linear PSU on / OFF It works fine with anything over about 2.1V DC on the input pins and switches the psu with full load with no excess he
Hello Andy, Sorted now, thanks. The flying connectors from the back of the serial card are embossed S4, S5, S6 and S7. But these don't match the Windows port numbering. The lead marked S3 was actuall
Hello Nick, Thanks Nick, the pins are held low with the PC booted, which is hopefully the state it will be in with the PSU having power to the SSR. I have been warned they may dither on boot up, pres
