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Registered Member #3436
Joined: Tue Nov 23 2010, 04:12PM
Location: Latvija [Lettland]
Posts: 20
I Have assembled a generator part for my HV power supply!!! on the GDT out i have such signals, im not sure that they are normal... pleas coment some expert way the signal have saw shaped fronts??? its normal or not???
Registered Member #522
Joined: Thu Feb 15 2007, 01:04AM
Location: The Netherlands
Posts: 33
I wonder why it have different value resistors between the collectors of the tl494 and the transistors? Becouse the audio is on pin6 i think it is fm modulation becouse the audio voltage level chance the resistens and so the freqentie output of the tl494. correct me if i am wrong !? When you feed it on pin4 it is am modulation.
Registered Member #522
Joined: Thu Feb 15 2007, 01:04AM
Location: The Netherlands
Posts: 33
You must have a resister and a smal nf load parallel on the output of your gdt, Then you can scoop the picture. The resistor and cap act as gate load. Try something as 1k ohm with 1nf ceramic c And i think your Gate drive needs a low resistor in serie with the primary gdt winding try something between 1 en 5 ohm and at the other primary drive side a cap of 2 100uf antie-parallel (+.- -,+) with a 100nf ceramic c parallel with the first cap's. Then this must be oke, then you have to tune your gdt design maybe a litle bit to get the right blok look on your scope:-D
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TL494 wave forms
