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  1. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    hevans, audiog, ak, thanks so much for the informative lesson in hysteresis. I have learned a lot. Progress report: I have started populating the board with the components that I have managed to acquire so far. Finding components in the sharp end of Africa has been a headache so far. Ag, I...
  2. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thank you very very much Hop. Above and beyond the call of duty. Was up late last night poring over this: http://www.ti.com/lit/ug/tidu020a/tidu020a.pdf Please just confirm that the guy who wrote this knew his rear end from his arm joint. Now to find an opamp in my meagre stocks. Spice...
  3. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks hevans, apologies if I'm starting to irritate you. This is heady stuff to get my 62 year old brain around. I am going to draw this in spice and see if I can figure this lot out. OK, slapped my brain into gear (no alcohol involved) and I think I now get the oscillation problem I am going...
  4. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks Audioguru, will get to that Lm339 discussion shortly. How about this design: http://www.electroschematics.com/6123/dc-fan-controller/ Man, I expected this to be a very short sideline to add a bit more functionality to the psu.
  5. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks hevans. Yes, I have always realised and accepted that this could be a troublesome project. But I expect it to to a very educational exercise and so far I am learning a huge amount very quickly, including not trusting professors;) I am still slaving away at the LTSpice simulation of this...
  6. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks Audioguru. I am stunned. I knew there are lots of dodgy circuits on the internet but I didn't expect one from a university with an assistant professor involved. I looked at the LM358 internal layout but that is way beyond me.I also realised that there could that oscillation problem at the...
  7. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Thanks for the valuable feedback Audioguru, much appreciated. You can now see that I am a professional magic smoke producer. Thinking about your comments you are probably correct. A fan that turns on and off at set temp. points is preferable to one that is constantly revving up and down. So I...
  8. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    My lack of electronics knowledge is very evident here. I have tried to make sense of what Audioguru was saying about the bypass capacitor ( The LM 555 datasheet actually talks about 2 capacitors :confused:) and the fan connected between the positive supply and the 2n222 collector. Here is my...
  9. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    I kept seeing references to Hiland in threads but have never managed to find the source
  10. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    I'm afraid you're outta luck Audioguru, still very much alive: https://www.banggood.com/0-30V-2mA-3A-Adjustable-DC-Regulated-Power-Supply-DIY-Kit-p-958308.html?rmmds=search
  11. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Probably the first of many questions regarding this build I don't want the fan on the heatsink to run continually but I want it to come on when the heatsink gets too hot I found this design on electronicshub.org Will this work Ok? Or can it be improved?
  12. bushtech

    Getting kids into electronics

    Yep, making something work via plug and play is about at the level of a monkey flicking a light switch
  13. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    Some bits and bobs I've been rounding up: Want to use the heatsink from a cpu. Just need to temperature control it via the 3 cable connection And a nice surge protected power plug
  14. bushtech

    Power-One power supply mod

    New thread started here: https://www.electronicspoint.com/threads/chinese-hiland-0-30v-audioguru-psu-build-down-the-rabbit-hole.286096/
  15. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    And his parts list:
  16. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    This thread is follow on from here: https://www.electronicspoint.com/threads/power-one-power-supply-mod.284923/ The main characters in this plot are: The infamous Chinese pcb And Audiogurus's redesign
  17. bushtech

    Power-One power supply mod

    There is some fantastic info being shared here by the gurus. But I think I must start a new thread about my pending build so at least the info fits in with the heading.
  18. bushtech

    Power-One power supply mod

    It's so nice when you come across honourable people these days. Manufacturer will take back old transformer, give me a 240Va version and I pay the difference.
  19. bushtech

    Power-One power supply mod

    Well, you guys were correct. Manufacturer states the 120Va is shared by the secondary's:( Some serious negotiation coming up.
  20. bushtech

    Power-One power supply mod

    Thanks hevans1944. Wise words as always. I'm only shooting for 3A. I am learning quite a lot already. I have started putting this circuit in LTSpice so I can see if the simulation matches what I read on the pcb. Lol, and I have also learned something about speccing transformers and how difficult...
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