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  1. bushtech

    Power-One power supply mod

    @Audioguru.: Thanks for replying. I am sure you are dreading what this thread could turn into. Are you talkig about the transformer I chose? I am battling to make sense of the massive amount of info on these power supplies. I am planning to replace the TL072's with TLE2141's. With what little I...
  2. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks for all the insights guys. I am going to buy one replacement battery and the other one is going to turn into an experimental thing, maybe source some individual higher amperage batteries, build them in myself to see if my soldering works and using something like thick multistrand silicon...
  3. bushtech

    Power-One power supply mod

    Update time: Well, after a lot of headscratching I took the plunge and ordered the el cheapo kit from China (Audioguru: stop banging your head on the desk:D) Partly because it's cheap and that's rather a large factor in a retired guys life, and partly because I think that it will be a very good...
  4. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks kellys_eye. Just looking forward a bit. This is now strong current stuff, not like a torch battery. I'm sure I can get this disassembled,(my dremel or small sharp chisel) but if I get new batteries, will some good soldering be as good as the welds?
  5. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks for the heads up Bluejets. Hmmm, maybe I'll just have one repacked and see. Drill still in very good cond. so would hate to dump it. Is it possible to break the sonic welding with a soldering iron? I have never been successful. Small blowtorch maybe? Or give it a brief 220V heat...
  6. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks kellys_eye. These blighters are sonically welded. Heh, these are totally dead, I briefly see 0.2Vo_O "mammaries skywards":D
  7. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks Edd. I'll have a dig around and see what I can find. Your thinking that the charger is OK carries a lot more weight than my opinion, so I'm hopeful. Some googling turned up these guys: http://www.batteryexperts.co.za/battery-repacking/ The repacking carries a one year guarantee and I'll...
  8. bushtech

    Automatic Blow Off For A Conveyor

    Why not just blow the bottle off the scale?
  9. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Hi St Edd Heh, normally around lurking and learning. Heatsinked regulator: TYN208 16 pin IC: 6HKB 0750.... 6K71217R V8: 2N3906 V9: 2N3094 Purdy lil' blue cap: 33μf/50V 2007 vintage. Batteries showing 0V My intelligent CTek battery charger wants nothing to do with these batteries...
  10. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    Thanks Bluejets. There is a green indicator light that comes on when charger is powered up, with or without battery. Bit difficult here in the bush and buying a new battery out of the question if the charger is suspect.
  11. bushtech

    Bosch Cordless Drill GSR 12-2 Charger testing

    This drill stopped working and I discovered that the batteries were flat/not charging. Now either the batteries are history or the charger is not charging the batteries. How do I check whether the charger is working? I get 17V AC coming out of the transformer and roughly the same in DC after...
  12. bushtech

    Power-One power supply mod

    Thought so lol. Libre office opens it, but anyway it just contains instructions about the display set up. Sad to hear that it's regulation is probably awful. More navel contemplation required
  13. bushtech

    Power-One power supply mod

    Well, the plot has thickened to pea soup consistency. I am busy eyeing this version which comes with a display. I see they have lowered their sights to 28V and 2A. Interestingly it uses an A1941 power transistor and no IC's. The good old 7824 still there which I suppose could be changed to a...
  14. bushtech

    Power-One power supply mod

    Thanks kellys_eye. Very good idea. Can probably do some fancy footwork with dpdt switches an suchlike. Still pondering this lot.
  15. bushtech

    Power-One power supply mod

    lol. I didn't even know that, I just followed the muffsy design which called for 2 rails. Well we have now moved very far from ordering a $5 supply from China and sourcing some ancillaries to having a pcb made (at a cost which is still unknown but it won't be as low as $5) buying all components...
  16. bushtech

    Power-One power supply mod

    Audioguru: Please have a look at my first post on this thread for a look at a dual rail supply:) But if this is very unusual am I wasting my time building a dual rail supply? It certainly would have been useful when I built my quad opamp version of the muffsy phono preamp. Instead of stuffing...
  17. bushtech

    Power-One power supply mod

    Thanks Audioguru. So will I be OK if I go with Rev 7 schematic in the first post.? Still wading my way through that lot. Will this design be good for 3A? How would this transformer do? http://www.mantech.co.za/ProductInfo.aspx?Item=65M0036-H Hmmm. Quite expensive that transformer
  18. bushtech

    Power-One power supply mod

    @Audioguru: Is this what you are referring to: http://electronics-lab.com/community/index.php?/topic/40835-0-30v-0-3a-latest-data/&
  19. bushtech

    Power-One power supply mod

    Some googling turned this up: http://www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html
  20. bushtech

    Power-One power supply mod

    ak: Building a modified muffsy phono preamp showed me that 2 rails could come in very handy Audioguru: Thank you for taking the time to explain the shortcomings of this design. Where can I find this improved design? Is it available or are there copyright issues?
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