A parts or repair Tektronix 2465 Oscilloscope (Ebay...collection only...$50 dollars) passed the Earth Bond and insulation tests for Class I devices. I plugged it in before inspecting it internally (my first mistake).
After the smoke cleared, I pulled out the power board (photo 1) and saw two...
The best way to get overunity cultists to understand the laws of thermodynamics is by referring to a hose.
The most hardcore overunity cultist will be forced to accept that one cannot get more water out of the end of a hose than one introduces into the beginning of the hose (from a tap for...
Heralding the 25th anniversary of the Linux Kernel, would be interested to know if members compiled their own kernels to mark the occasion, how you went about it, and what your experiences were.
Amusing candidate solution.
From a linux box, burn an ISO of Android 6 using k3b or similar burning software. You should be able to burn an ISO of Android 6 using WindoZe as well, if you can bear it.
I installed Android 6 on an i7 desktop PC, and to my surprise, it installed and it was very VERY...
Hi All.
Daimler forwarded the idea to their joint heads of engineering before sending me a polite letter to the effect that they did not intend to buy the patent. Their letter was signed jointly in manuscript by both their heads of engineering..electrical and mechanical). QED.
Had data been...
Do not attempt this unless you are safety certified and have electrical engineering expertise. Wear protective gloves and do not use both hands near the circuit. Use a high voltage certified multimeter. In fact, do not attempt this repair unless you are safety certified.
The safest option (not...
If you have a schematic, check the voltage rails.
If the voltages are as they should be, some suggestions.
1. The 10v 100uF Polymer electrolytic capacitors in the photos may be rated for 85 degrees C. Replacing them with 105C caps is tiresome but may help if hot air from the engine affected...
A further idea. There is an excellent video on Youtube by Dave Jones from Australia (EEV Blog) about tracking down defunct ICs (in this case Op amps) that failed due to over voltage arising from a defective power supply rail. He iterates that 'under voltage' issues can never cause problems with...
Dreadfully sad to learn Kris passed away. What a terrible terrible shame. An utterly brilliant mind and so patient with everyone, experts and newcomers alike.
Everyone here present is diminished by his loss, just as will everyone else will be diminished in perpetuity. What I would have given to...
Good advice to which I add my fascination with such devices led me to what appears to be the service manual for this attractive machine. I make no warranties as I did not attempt to download the manual but here is the link in the hope it may be of help...
As I understand it, the essential requirements for a switching power supply are:
Gated oscillator (anywhere north of 100kHz) x 1
Operational amplifier x 1
Voltage reference
Resistors x 2 (voltage divider)
NPN (darlington pair) series pass transistors x 2
Filtering Caps x 2 for input and output...