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  1. bushtech

    Tektronix TDS3054 data acquisition failure

    Let's hope it's a component and not a chip
  2. bushtech

    Tektronix TDS3054 data acquisition failure

    This might help:
  3. bushtech

    Yamaha rxv1070 receiver struck by lightning

    Try this: https://www.manualslib.com/products/Yamaha-Rx-V1070-36595.html
  4. bushtech

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

    Do you place your fuse before or after the main switch, ie between power plug and main switch or between main switch and transformer?
  5. bushtech

    Successful Stanford Research SR530 lock-in amplifier repair

    That's an understatement, R138 looks knackered:eek:
  6. bushtech

    Sony Amplifier TA-AX3

    There's a phono input on the far left for record player so presumably your unit has a phono preamp built in
  7. bushtech

    Are those blown capacitors?

    As 73's de Edd has stated it's a 50K analog taper pot, but you need a pretty good match so that it fit's in the hole and knob fit's on correctly (You get different diameter shafts)
  8. bushtech

    Are those blown capacitors?

    I'm no expert but that looks like glue to me
  9. bushtech

    Denon AVR-1912 E2/EA

    Now that's a bit of progress!
  10. bushtech

    Successful Stanford Research SR530 lock-in amplifier repair

    :eek:
  11. bushtech

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

    Heatsink mounting: The idea is that the fan is going to blow into the box straight onto the 2N3055's. The heatsink will be insulated from the rest of the box so all air goes onto the heatsink and forced up and out:
  12. bushtech

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

    I am going to be using a fan and shooting for forced air ventilation straight onto the heatsink. Will be posting some photos
  13. bushtech

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

    Thank you so much for all the help Audioguru. Now for the tricky job of shoehorning it into a box
  14. bushtech

    Successful Stanford Research SR530 lock-in amplifier repair

    Just to show my lack of knowledge - will it do a nice rendition of Jimi Hendrix's Star spangled banner?:oops:
  15. bushtech

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

    Audioguru I think the power supply might be working now but I am still scared that the opamps might have been damaged during my short circuits saga. Here is a set of voltages taken of the opamps in circuit: Both pots set to zero Please have a look if these Voltages are as expected. Bit...
  16. bushtech

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

    Display working great with independent transformer winding, bridge rectifier and 220μf smoothing cap: Thanks again 73's de Edd and Audioguru
  17. bushtech

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

    Great, thanks a mil Audioguru
  18. bushtech

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

    Brilliant Audioguru Thanks In my meagre supply of electronic components I have 220μf 35V caps. Will that work? Then for a dummy like me, how do I wire it up, in series in the positive line?
  19. bushtech

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

    St. Edd My beta version of transformer winding, now giving 12.1V AC Now where do I go from here? Just a bridge rectifier or is more required? The meter draws <20mA and requires a supply of 4.5 to 24V
  20. bushtech

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

    Thanks a mil Audioguru. Looks like it's working now. Getting -1.4V on pin 4 The 894 will be 0.894V measuring across both D7 diodes with DMM in diode function. When I pulled the diodes to swing them around I measured them and and I did get about 1.2 V
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