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  1. bushtech

    Smd resistor unbelievable

    Oh, and it's a UPS
  2. bushtech

    Smd resistor unbelievable

    Thanks Edd This might help: When the infamous resistor went a leg on each of 2 transistors (see 2 red lines) got desoldered. Edd, the resistor R83 sits close to cap C20 on the top view. R83 looks like one side connected to one leg of Q21 and the other side to R82. I cannot read anything on R83
  3. bushtech

    Smd resistor unbelievable

    Lol. It sure does not look like that! There are similiarities, but my schematic does not talk to the pcb here
  4. bushtech

    Circuit with piranha leds

    And if I've got something wrong will the wise men on this forum please advise
  5. bushtech

    Circuit with piranha leds

    Look, we've pretty much got the blind leading the blind here, but as long as you get your mind about this bit from the link I posted, you'll be fine: "LEDs are inherently unstable when operated from a voltage source. The answer is to operate them from a current source as the manufacturers...
  6. bushtech

    Circuit with piranha leds

    we're going to need the specs of your led
  7. bushtech

    Circuit with piranha leds

    This helped me to get my head around LED's. Prior to reading this I was getting quite good at making the magic smoke appear: https://www.electronicspoint.com/resources/got-a-question-about-driving-leds.5/
  8. bushtech

    Tektronix 2235 Sweep Generator (horizontal mode) A issue

    You Alfred Hitchcock by any chance?;)
  9. bushtech

    Smd resistor unbelievable

    Well spotted kellys_eye. Thanks. This diagram might not then be exactly what I have. Investigation required
  10. bushtech

    Smd resistor unbelievable

    Here is the circuit diagram showing the resistor R83
  11. bushtech

    Smd resistor unbelievable

    I have got a burnt resistor that needs replacing. Schematic says 300Ω 5W. As far as I can tell this is an 0603 type smd. (0603 type 1.6x0.8mm) Can't find any resistors 300Ω 5W in a 0603 package. Does such an animal exist? I have difficulty believing that something that small can handle 5W...
  12. bushtech

    Heathkit ET 3400

    Thank you hevans1944. Fascinating stuff!
  13. bushtech

    Solar powered power brick

    Ugh! Sun out now. Even pointing the solar panel aligned at the sun I only get 50mA. Looks like I bought a pig in a poke
  14. bushtech

    Solar powered power brick

    I haven't been able to find a similiarly sized panel with a higher charging rate so might go for something like this which should kick butt. https://www.banggood.com/Universial-5V-5W-USB-Solar-Energy-Panel-Charger-For-Tablet-Cellphone-p-1139819.html?rmmds=search
  15. bushtech

    Solar powered power brick

    Overcast day here. Stuck my DMM in the line from solar panel to pcb. Getting 5V but only 8mA. Rubbish solar panel?
  16. bushtech

    Solar powered power brick

    Hmmmm. I'm going to unsolder one lead from solar panel and stick an ammeter in there and see what it gives. Thanks for the heads up @debe
  17. bushtech

    Solar powered power brick

    Oops, sorry, blonde moment. Red-E brick http://www.red-electronic.com/products/powerbanks/red-e-solar-powerbank-rs80-detail And thanks Bluejets, you're right, Input 5.1V
  18. bushtech

    Solar powered power brick

    Got this brick fairly recently. Noticed on overlanding trip that brick was not charging via sunlight. Charge it from my cellphone charger and charges up fine. But I can leave it sitting in the sun for days and state of charge does not change. Can be seen by 4 blue LED's that light up when fully...
  19. bushtech

    Can it be saved

    Help us to help you: https://www.electronicspoint.com/resources/how-to-take-photos-of-circuit-boards.6/
  20. bushtech

    Faulty Receiver

    Subliminal advertising on a go slow strike so that they become visible?:) But seriously, my crystal ball in for repair. Please give some more information, what kind of receiver you using, how are you receiving signal, cable? Does it happen on all channels?
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