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Registered Member #1773
Joined: Tue Oct 21 2008, 06:56PM
Location: Poland
Posts: 93
Helo, i must make audio modulation for my sstc. I use this schema for build my sstc and this work but i know he is not very good schema. I dont have money :(. I bulit this:
This is efect for 130-150V in halfbridge.
I can make this with 555 generator ( 120khz (this resonant for my secondary) plis 74hc14) and this plus audio in tl494 and out tl494 plus mosfets drivers tc4421/22 ? Can you give me schema?
I can make use this shema but in feedback i give 120khz from 555, i change two tc4422 and tc4421 in one tc 4422 and one tc442- i give signal in this drivers in schema:
Registered Member #1730
Joined: Thu Oct 02 2008, 08:12AM
Location: Poland
Posts: 35
To upgrade your SSTC to audio modulation You should give audio syg. on Q1(bc107) in place of interrupter. This should be good, but I don't really know, I think it should .
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
You should also add something to the top of your coil for break out. As it is it looks like the arc is burning your (pvc?) form. Either get a topload, or use a ring of say copper pipe or even some heavy gauge wire.
Registered Member #1658
Joined: Thu Aug 28 2008, 11:27AM
Location: Yungaburra Qld Australia
Posts: 8
I am looking for a audio mod for the schematic from steve ward on his sstc5, i have seen so many coils but they wont give there schematic or i just cant find one, any way nice coil and would like to see more of it
Registered Member #1773
Joined: Tue Oct 21 2008, 06:56PM
Location: Poland
Posts: 93
Hello, i have new problem with new mosfets w25nm60n, how i must give volts for normal open this mosfets ? I see in catalog ~18V, its good ? When i gi ve 12V from gdt+ tc4421/22 he don't normal open- mosfets are hot and have bad sparks.. i must make new gdt: 1:2:2 ?
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
It will work but it will not work well. I recommend you going with the ucc series mosfet driver chips and putting the oscillation signal in the input pin and the audio into the enable pin. If you want even better results i recommend instead of the fixed oscillator you go with a antenna feedback design because streamer loading etc. will change the resonant frequency.
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
Maybe the circuit will work, but why an extra oscillator? You would not need more then one single 555 where you feed the audio signal on pin 5.
Teslacoolguy, I don't think an antenna would be able to get the signal, and if it will, it would properly be the wrong signal, a CT on the output would be much better. But untouched flybacks would kneel if you every run them in resonance because of the huge current that would run through them.
BEEEP----------------------- This is wrong! I totally misunderstood everything I thought this was a flyback driver not a SSTC driver!
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sstc + audio modulation
