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DC-DC 12V-1kV
Are pin 6 and 12 connected inside the tube ? Are there given voltages in the datasheet ?
Tuesday, 10 April 2012 - 18:52
DC-DC 12V-1kV
My tube DG 7-74A is from this equipment: http://shortwaveradio.ch/radio-m... This equipment was certainly meant for continous operation over some years. The base-line is heavily...
Tuesday, 10 April 2012 - 11:34
DC-DC 12V-1kV
I have seen that some scope clocks always move the picture slowly a small amount in order to avoid the wear out of the phosphor.
Tuesday, 10 April 2012 - 05:21
DC-DC 12V-1kV
Congrats, the shadow-lights probably will disappeear by reducing the beam intensity. What is the supply voltage of your deflection amp and what is the collector-resistor ? In my...
Monday, 9 April 2012 - 20:35
DC-DC 12V-1kV
I have no regulation/feedback. The load seems fairly constant so I simply let it pump. Do you have the data of your tube ? Old scope schematics are also interesting to get ideas...
Monday, 9 April 2012 - 12:56
DC-DC 12V-1kV
Here you can see a short video of my scope-clock http://www.youtube.com/watch?v=h... The clk gets its time from DCF77 time signal transmitter. Below the center you see a "rolling...
Monday, 9 April 2012 - 08:43
DC-DC 12V-1kV
Hi Svo, bringing up the 6.3 volts of the heater is a real pain. inmy scope-clock it takes I think more than 30 seconds to heat up. Sometime its good to limit the supply current....
Sunday, 8 April 2012 - 17:52
What kind of filter is that?
The circuit is also interesting if you want to filter a high voltage signal with small ripple. You omly need low voltage opamp (with some protection) and two HV capacitors and get...
Saturday, 31 March 2012 - 16:42
What kind of filter is that?
I made a little hand calculation. Looks like a second order lowpass. Simulation with LTspice confirms that: It's a second order lowpass. The exact characteristic depends on the...
Saturday, 31 March 2012 - 09:36
DC-DC 12V-1kV
The master of perf-board and magic smoke responds: Attached see my scope-clock. The EFD30 transformer is surrounded by HV fast rectifier diodes and HV elcaps. The 4 small...
Monday, 19 March 2012 - 17:11
DC-DC 12V-1kV
After some digging in my paper-storage I found it: In my scope-clock I operate a DG 7-74A tube using the following SMPS design (EFD30 core): primary: 6+6 turns push pull from 12V...
Monday, 19 March 2012 - 16:34
DC-DC 12V-1kV
You sometimes can get some nice MOSFETs from old motherboards. In a push-pull it is important thet the primaty is very "symmetric", best is to wind two wires bifilar (together)...
Saturday, 17 March 2012 - 12:38

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