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  1. roughshawd

    KZG 6.3v 820uf cap

    I have an HP pavilion that started throwing a BIOHD-4 Error and I found a Smart Error on the main 320g drive. According to the specs, this system can't format anything over 320g, and I have installed two(2) 500g init. So looking the motherboard over, there were a few bulging caps, so I replaced...
  2. roughshawd

    Wallwart specs

    Assuming my VOM works when it reads over 18vdc on my wall wart... Why does my digital oscilloscope show nothing? 20v 50ms....
  3. roughshawd

    What kind of equipment would I need to diagnose an Italian Electric piano?

    I have found some very scary things in this electronic piano. Loose wires, cut board traces, chips that I can't find datasheets for, and oddly enough, most of it worked when I got it! I can't find a manual, but I did find a schematic, and thats all I should need.. right. ok I re-connected all...
  4. roughshawd

    Axial C testing

    It was my understanding..,that a capacitor,when tested with a vom, that it would count up until it reached infinity... Why then does an axial just test like a resistor.. or is that a bad cap?
  5. roughshawd

    Cordovox piano G keys dead

    Got this farfisa style electronic piano... It has an intonation problem in the c-c#d-d#-e section, and no g's will play. It is a pp23 unit, Italian piano, from the famous accordion maker. I bought the schematic and will attempt a fix... Does anyone know anything about these??
  6. roughshawd

    depricated=antiquated=aging=old

    I got a ricoh wide format duplicator that had a issue without starting, so I called the number on the machine. There were some Pakistani or something on the line whose accent so hard to understand I felt put out and they connected me to a manager who wasn't much better. I need you to know this...
  7. roughshawd

    Vidikron Crystal One

    Has anyone ever heard of a crystal one projector without built-in control panel?
  8. roughshawd

    Speaker output ohmage without information.

    Is there a meter test I can perform on the speaker output terminals of a device, to get the ohmage they are supposed to support??
  9. roughshawd

    Vidikron crystal one ifr eye codes

    Does anyone know what kind of remote control I would need for a vidikron crystal one projector? Or what codes are needed in a universal one? It has its own built in speakers and external connections for stereo.
  10. roughshawd

    Hacking the op amp...

    The chip is a dual op amp. Can someone tell me what I am looking at?
  11. roughshawd

    Deadly repair.. hamon crodan

    Ok first time for everything. fixed the bulging main caps, and put it back together... Bang goes the fuse... what did I do?
  12. roughshawd

    Archaeological tools

    How would one go about building a ground penetrating radar that will read 7" deep in volcanic fallout clay...?? Just dreaming....
  13. roughshawd

    Loud pop on transducer switch

    First question... Happy New year! Happy Valentine's Day and Happy Easter in case I miss... What size snap capacitor should I use on 4.7 ohm transducers to stop the spike when I switch a Baxandall tone board on and off?
  14. roughshawd

    Old board schematics

    There was once an old electrician technician who made wah wah pedals for sale. His initials were probably JR, and he was building his fourth wah wah. There was such a demand for his pedals that he hired out to a big company named regal to make a bunch of different wah wahs, some that had fuzz...
  15. roughshawd

    Hernia surgery this Tuesday

    I was so glad in the 90's when big profit decided to change into the lighter weight accessories. Too bad it was all fairy tales and myths. The next thing I know... I am trying to re arrange my studio and wrestling a 57" Bravia around... In the future.... Remind me to never believe what I hear...
  16. roughshawd

    Speaker capabilities of consumer products

    The older 1960's and 70's equipment were bomb proof, in that it was easy to add extra speakers to enhance the listening experience. How are the newer pieces? I have a nice projection TV, that is driving a set of 5" full range rounds at 10w and 8 ohms... What's a bit needy as an entertainment...
  17. roughshawd

    Board cleaners....

    Can Everclear alcohol be used to clean sticky buildup from old PC boards without lifting the traces,?
  18. roughshawd

    Harmon/Kardon AVR20II. No output

    Using the test button I get only C and R. So I can say it's not the power plant... Look at the size of the diodes!!! Typical seventies bridge! The transformer is a fine example of that era also... I don't think the heatsink is bad... unless there is a ghost in there.... Get out of there you...
  19. roughshawd

    Schematic question ...

    My PSU is a simple AC to DC voltage dropper that employs a transformer and a few transistor and some rc. The transformer is center tapped, and the schematic I got for it, shows the tap as grounded, and the circuits divided with a 200v 35w cap. I'm increasing the amperage capabilities of the...
  20. roughshawd

    Antenna conversion

    I have a small security camera system that is incapable of sending the signal from my shop to my residence. Can I convert the antenna to a 50 ohm marine whip, the camera will work in my shop too?
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