The purpose of C1511 is to compensate for the stray capacitance that you have from Q1508B base to ground. This is why a typical value would be for example 10 to 47pF and not 0.1uF. Göran

I once went to a course in London, Frequency Synthesis by a Robert Dixon, an American. He said - call me Bob, Mr. Dixon is my father (sorry folks, I could not help it). Göran

Mathematically it is not possible to compensate for this problem and the reason is that the dielectric constant is frequency dependent - and this is bad. Göran

Hi, I recall this topic quite well. Some years ago I uploaded an article from magazine EDN, I believe, which described the difficulties designing high impedance attenuators using an FR4 circuit board.

Gentlemen, I have followed this discussion with great interest. However, I have always had difficulty understanding how to design for optimum bias for a FET source follower. In this application, the i

Hi, the R1059 and C1059 low pass filter is filtering the +110V voltage, the values are not critical. Göran

yes, I have. I had a poor connection from vertical board differential output to the pins on the CRT, loose cables. Göran

Hi, is there a hissing sound? If so you have got arcing. It could be the HV multiplier that is your culprit, this would be bad news. Try to locate my message from several years ago for more details. C

You need to check every pin if you suspect anything being wrong.

Hi, if you have oscillations caused by very long leads to the power transistor, you mentioned 60 cm which would have an inductance of 600nH approximately, then you can most likely solve this by solder

Hi, do not pick the DM501 or the DM502. If you are measuring voltage and without thinking, like I often do, would turn the switch into the current range your object will be shorted by the multimeter a

Hi, the A sweep runs for a certain amount of time (this is the delay) before the B sweep begins to run (often at a faster rate than the A sweep) Göran

I need to comment on this. The lady´s lab bench is way too small. She should have had a bench the same size as her male colleagues. Göran

Also, search for Jim Williams and his design books, this is very good reading! Göran

Hi, what about this approach. To the left you add up 3 admittances and to the right you have one admittance. To the left you adjust for any values you like. To the right you adjust for balance which o

Perhaps it should be Yngve? That is the way I would spell it. Göran Den lör 4 jan. 2020 23:29Dennis Tillman W7PF <dennis@...> skrev:

Hi, quite possible that you have an oscillation here. If so something is broken. What you can do is to measure all DC voltages in this amplifier and compare with the schematic. If you find unexpected

Hi, there is a peculiar property with emitter followers and FET source followers. Under some circumstances they will provide a negative input impedance. This with a certain source impedance will start

More. You can check diodes by making differential measurements across the diode. I found two bad power diodes this way. You can do this measurement while the unit is in tic mode. I found the diodes co

You need a load of about 50W, possibly equally shared between positive and negative outputs. Either on the raw voltages or after the regulator board. You need to check all caps and diodes on the recti