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Looking at the datasheet for the oscillator there appears to be two distinct types, one for a 5v supply and one for a 3.3v supply.
Could the problem be 3.3v parts inserted in a 5v circuit?
JimB
Yes,
There is no decoupling capacitor from the +ve supply to the 0v (Ground) line. Try a 10nF.
At a quick and dirty calculation, the oscillator frequency appears to be of the order of 2MHz.
Some breadboards can be a bit funny at high frequencies, although at 2MHz I think that you may "get away...
Probably because it works and it seemed like a good idea at the time.
Also consider that when the project was done, the designer thought to himself
"I am not doing opto switches like that ever again".
JimB
I think that I am all messed up in my head with this one.
I have been looking at an ancient circuit diagram of a spectrum analyser which used a DG-7-5 CRT.
The cathode and grid sit up at around -1000 volts
The focus anode appears to be adjustable between -955 an -460 volts
The second anode...
Just an excess of caution, it feels like a good thing to do in an unknown experimental situation.
Just use the four resistors.
The voltage rating refers to the voltage across the resistor.
In this case there should be no current flowing in the resistors so the voltage across the resistor should...
In addition to what Nigel says, connect the deflection plates to your 260 volt supply through four resistors (ie one resistor to each deflection plate).
Make the resistors 47k to 100k in value.
JimB
I agree with that.
However, in the video the guy did measure many resistors which appeared to be high in value.
It would be interesting to know what made them high resistance...
Possibly it is that they are the cheapest crappiest resistors available.
I would expect many resistors to "go high"...
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