I'd like to increase a waveform from a Siglent SDG2042x function generator. The function generator output will be connected to a 10W power amp which would drive the transformer.
I'd like to increase a waveform from a Siglent SDG2042x function generator. The function generator output will be connected to a 10W power amp which would drive the transformer.
Well mains transformers are intended for use at 50/60Hz, and don't really perform well at higher frequencies - and even specific audio transformer don't usually go anywhere near 100KHz (100KHz is ferrite core country, not iron laminations).
There have been people in recent times though using small mains transformers as output transformers in single ended valve amplifiers, with reasonable success, but with the lower quality of valve amps a lack of treble probably isn't too much of a concern.
You've also got the problem of 1KV though, any 'off the shelf' transformers are likely to be only intended for mains voltages - but if you can get transformers intended to output 1KV from 120V they should be OK. You could certainly try two transformers in series, and see what happens.
Well mains transformers are intended for use at 50/60Hz, and don't really perform well at higher frequencies - and even specific audio transformer don't usually go anywhere near 100KHz (100KHz is ferrite core country, not iron laminations).
Looking back a couple of months there were some discussions about measuring distortion on a mains supply and the frequency response of a transformer used for safety isolation.
At the time I did some simple frequency response tests on two small transformers, the results are reported here:
Without reading through the entire thread, this looks like the lack of a ground. If you are using differential input to the scope, the source still has to have some kind of a ground reference or the noise will get though. Tie the safety ground and the neutral together and connect the scope...
www.electro-tech-online.com
With those results in mind, my first thoughts are that using a mains transformer up to 20 or 30kHz may be OK, but 100kHz would take some thinking about.
Maybe use two separate transformers, a nice chunky iron cored one up to say 20kHz, and a ferrite cored one up to 100kHz.
20hz to 100khz is a very wide range. A ratio of 100:1 is fine but 5000:1 is too far. At 20hz you need a large transformer and at 100k you need a small transformer.
When you say 10VA, I understand you have a 10 watt amplifier. What is the output current? How much power on the output? What are you driving?
Did you find a audio amplifier that will work to 100khz?
I have made transformers for 30khz to 120khz that output 1000V at very low current to drive CRT monitor focus grids.
I have made amplifiers that did DC to about 30khz at 1kV at very low current. At high frequencies they get hot. I can not get high voltage transistors any more but I may have some old ones.
Not really my field, however electrostatic speakers usually have a step up transformer in them, I think they are around that voltage, you might be able to get one as a spare part.
But dont expect 100kc though, around 25kc would be the max.