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| John Rudd:
--- Quote from: John Swift on July 18, 2010, 07:36:39 PM ---Hi Rob , I have made a medium wave transistor radio with denco coils in the past later adding a shortwave converter to the mw radio tuned to 1.6MHz I would like to have a go with a valve (tube) TRF radio when I have the time --- End quote --- Ahhh.Denco coils... ( Clacton on Sea Essex... :clap: ) Reminds me of when I were a lad reading Gilbert Davey's book 'Fun with Radio'.... a single valve trf receiver using a DF91 ( or IT4 if you like) Happy days... FWIW, my first ever radio I built was a crystal set that my dad bought me...it needed a soldering iron for assembly..Not deterred by this, I managed to'dry' assemble it and have it work... :clap: |
| John Swift:
Hi Jack you have not given any details about your stepper motor , is it a unipolar or bipolar motor ? if you just want to just test the stepper motor out for now try some thing like the 3187KT bipolar motor driver or 3179KT unipolar motor drive kits from Quasarelectronics.com with a simple ne555 ic oscillator providing step pulses ( could be a modified audio signal generator kit ) I'm a few steps behind you , I have thought my fist step is to provide a variable speed drive to the lead screw to get a practical feel for the torque and maximum speed of the stepper motors but first I need to get my old ( new to me ) lathe going first Hi John , would that be the green octal plug in ones those battery radio valves work ok of 3 or 4 9v batterys for the HT supply you can find scans of the old 90v batterys if you want to make your own John Swift |
| kwackers:
Jack, I know you want to make your own - but if it's any help here's one I made earlier... http://www.cnczone.com/forums/showthread.php?t=47007 There's source in the first post which might help too. Re: the 90v radio batteries, a few years ago I made one for a guy I knew. Basically just a set of rechargeables and inverter built into the case of an old battery with a socket on the bottom to charge it up. Worked a treat and even losing the space for the inverter it still ran far longer than the original battery. |
| raynerd:
I converted my 4" vertex using Kwackers divider...it is great - http://madmodder.net/index.php?topic=2242.0 |
| John Rudd:
--- Quote from: John Swift on July 22, 2010, 07:07:09 PM --- Hi John , would that be the green octal plug in ones those battery radio valves work ok of 3 or 4 9v batterys for the HT supply you can find scans of the old 90v batterys if you want to make your own John Swift --- End quote --- Ummm.I though they used the B9A plug/socket arrangement...? :scratch: |
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