# 42 kHz 30v p-p Oscillator Circuit

Discussion in 'General Electronics Chat' started by Mad Professor, Aug 7, 2009.

Apr 15, 2009
133
1
Good Day All.

I was wondering if anyone might be able to help me with making a 42 kHz 30v Oscillator Circuit.

I need a pulsed output voltage of 30volts @ 42 kHz with a 50% dutycycle.

What would be the best way about doing this?

Best Regards.

2. ### t06afre AAC Fanatic!

May 11, 2009
5,939
1,222
And what current do you need?

3. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
A good question. Another question, what kind of stability do you need? A 555 may be able to do the basic oscillator if you're not too picky, and then add a transistor driver afterwards.

Apr 15, 2009
133
1
Current is nothing big, around 500ma (15-20 Watts).

I would like the freq as close as possible to 42 kHz a +/- 5%, Idealy less then 2%.

5. ### t06afre AAC Fanatic!

May 11, 2009
5,939
1,222
What is your waveform specification, is it 0 to 30 volt, or +/- 15 volt. Please be more specific then you are asking question. If you had given us the full spec in your first question. You would probably have got your solution by now

Apr 29, 2008
98
0
7. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
Actually, he did specify a P-P voltage, 30V. I interpret pulsed as square, though there are other shapes, but 50% duty cycle cinches it IMO. Since transistor drivers (or MOSFETs) are a given, and neither the 555 nor CMOS 555 can reach the power supply, the type of 555 is moot IMO, though the CMOS 555 Hysteretic Oscillator will be a true 50%.

This is how I would do it. A regular 555 will work in this design, but it won't be 50%. A CMOS 555 will. Adjust the resistor for your frequency. There are no protections for the output drive, you overload the transistors they will burn out.

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