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Registered Member #4193
Joined: Mon Nov 07 2011, 11:21AM
Location: St. Louis
Posts: 33
Hello, (sorry for my englisch i am german)
I need an interupter for this schematic:
But, how can i built it. My idea is i use a "and" gatter first input ist the oszillator and the second input the puls from the interupter. But ist this a good solution ? I mean can the and-gatter make mistakes ? Work this good ?
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
A single AND gate on the output of the TL494 should work fine. However this will cut the pulses off in any random location. If you want to insure that it shuts off at a rising or fall clock edge you will need to also add a flip flop to sync turn off with the clock.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Exactly like that.
Set and Reset should be connected so they are disabled for the 74HC74 for example these inputs are inverted so they have to be held HIGH. The 4013 that you used in that schematic however is not inverted and must be held LOW.
Be sure to check the datasheet for the part you use.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Hi Technology Man,
If you are looking for a simple modulator (interrupter), i can send you a complimentary basic 555 based interrupter. Comes complete with circuit board and components. Its really basic, but i think it will accomplish what you want. If interested, just Private Message me with your mailing address and i'll ship one out to you this weekend.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Thats a great question. A modulator or interrupter is used to turn on and off a power supply which drives a Tesla Coil. It in of itself doesn't not really affect how long the arcs a particular Tesla Coil can put out. However, by varying the pulsewidth and pulse repetition frequency (PRF) of the modulator / interrupter, you can adjust the output of the Tesla Coil.
That said, an interrupter is basically just a pulse generator that typically has adjustments for pulsewidth and adjustments for the pulse repetition frequency. There are probably an infinite number of ways to generate this using either 555 timers, PWM chips, waveform generator chips, microcontrollers, etc...
To answer your question though whether the sparks will be long . . . spark length is more a function of the entire power system and Tesla coil itself rather than the type of interrupter / modulator being used. A single 555 timer with the proper pulsewidth and PRF settings can drive a Tesla Coil capable of outputting 20 foot arcs for example.
Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
hi All,
varying PRF can get the power consumption per time of the tc a bit higher (depending on the settings) so to speak, it can change spark length.. also same principle with pulse widths, more cycles, more power, more thickness and spark length.
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need an interupter
