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Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
Hello everyone. Just as title, i turn on my SSTC driver, with no input from the feedback antenna,with a led connected to the GDT... and it's noisy like bzzzzz.... even when i turn it on when attached to the tc, it's noisy. The thing is, the led is turning on and off.. but this noise from the GDT is normal?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Good, no. Normal, yes. The simple feedback driver circuit that is so popular with SSTC builders has no frequency discrimination. I wouldn't be surprised if it were picking up 50Hz hum from the line voltage.
If you're using an interrupter, the GDT will also "bzzz" at the interrupter frequency in the absence of any RF signal from the coil.
In normal use, the signal from the coil should dominate and everything should be OK.
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noisy GDT
The simple feedback driver circuit that is so popular with SSTC builders has no frequency discrimination. I wouldn't be surprised if it were picking up 50Hz hum from the line voltage.