The caps each should have about 1.4 x 117V = 163V on them. In the 110V position, the bridge rectifier, and the capacitors are arranged to be a half-wave voltage doubler. In the 220V position, they for

Roy, Faston connectors are supposed to be rarely mated... Kind of like panda bears. There is no way to de activate the dimple that latches them together. You can remove them more safely by using somet

When calibration is under computer control, the computer will automagically set all of the pertinent controls to their proper settings for you. If the inputs need to be 50 ohms, they will be set to 50

Check the connection of the faston connectors that connect the 110/220V selection switch. It looks like you forgot to connect them back up when you connected the supply back up. -Chuck Harris tekscope

Hi Gerry, First, you are not supposed to get a trace, just a pair of dots, approximately 10 divisions apart. This is a crucial step, as it affects all future steps. I would suggest that you always put

You know, of course, that tekscopes is not on yahoo? Right? -Chuck Harris Richard Tyner wrote:

For audio use, any bnc probe that can handle the voltage will work just fine. Look at the P6007 and P6009. -Chuck Harris Scott Adams via Groups.Io wrote:

Hi, I am in the middle of a frustrating intermittent problem with a CG5011, and need a right angle extender board for lifting the internal pc boards out of their slots. Anybody have a spare, or know w

Good point Raymond. Installing the stab connector at a slight angle to vertical, can wipe the spring right out of the mating connector. Stab connectors are made for only a couple of mating cycles over

The usual rule of thumb is unless your probes are specifically designed for high voltages, don't subject your probes to any voltage higher than your scope's input rating. So, don't skimp on the probes

Hi Matthew, The Feedback signal from U1371C leaves the one circuit board, and passes through the "stab" connectors to the other circuit board. At that point, it simply goes to the LED in the Opto Isol

No, it doesn't mean U1371 is bad. It means that the power supply output is low, and the feedback loop which uses U1371 as its comparison element is trying as hard as it can, but still can't force the

I mistyped, 5.87V should be 4.87V. -Chuck Chuck Harris wrote:

The reason for non detergent oil recommendations is not really important, but is as follows: Detergents are added to keep dirt and wear products in suspension so that in a pressure feed filtered oil l

When dealing with opamps that have negative feedback, there should be exactly 0V between the + and - inputs. If the voltage difference is even 1mV in either direction, the output of the opamp will be

Nye makes very nice lubricants, not oils, but actually liquid greases. They are designed for extremely slow motion with high pressures... like are in watches, clocks, and some instruments. Not so much

I tend to use a couple of lubricants for this purpose. Either Mobil 1, 5W30, or a turbine lube made by MARS, which stands for "Motors and Armatures, Inc." Mars 93240, in the "Zoom Spout" container. I

Hi Robert, There are quite a few different varieties of silicone oil, but one thing they all seem to have in common is they like to creep. This time next year, you will probably find the oil has coate

Silicon oil? That seems like a gritty thing to use. Perhaps you mean silicone oil? What would make you think that silicone oil is suited for this application? Educate me please! -Chuck Harris Robert S

It is just a power supply. I would start with fixing the +/-15V supplies, as they are used extensively throughout the rest of the supply for infrastructure purposes (eg. they power the power supply's