Driving KSN-1005A tweeter from 555 timer

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Post by Ivan on Tue Apr 09, 2019 9:27 am

Hi,
e.g. this mist maker uses 1700+-50 kHz according to its specification.

VBR from Ivan

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Post by zsolt on Mon Apr 08, 2019 6:28 pm

no big deal. I read that one could make a humidifier with piezo transducers. It's not clear for me what frequency and power but i saw youtube video doing that

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Post by Admin on Mon Apr 08, 2019 2:33 pm

That should work a treet, but the caps need to be changed if you want to take it up to high frequencies, as I did.
For lower frequencies those transducers are not so efficient. You would need a mid-range unit and a bigger choke for lower frequencies.

But the rest of the circuit looks really simple :-) Thank you for sharing it with us.

BR Harry - EA/SM0VPO

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Post by zsolt on Sat Apr 06, 2019 9:05 pm

hi,
look what i found (while looking for a radio)

Driving KSN-1005A tweeter from 555 timer Siren11
the speaker looks like the one from the datasheet

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Post by Admin on Wed Apr 03, 2019 8:42 pm

Admin wrote:Hi Ken,
I will give you a longer reply to this in the morning. I did exactly what you wanted, about 8 years ago. It was a to deter cats from entering an open are inside the house. Worked a treat :-)

BR Harry - SM0VPO

Hi Ken,
Sorry about last night, but a lot was happening and it was a bit late.

When I lived in Lunda I had a basement sitting-room (gillestuga) that the previous owners used as a junk storage room. So there was little heating over the years, was a little musty, and their cat had spent years clawing on the stored furniture and left a lot of evil-smelling puddles. The problem with un-castrated cats piss is that it stinks terrible, and it invited our (house-trained) cats to use this established toilet.

There was no door that we could close, just a door to the boiler room, workshop and garage. The room was accessed by stairs from the first floor. There was no way we could block it off.

So I took a simple multi-vibrator and ran it from a 12-volt supply. This multi-vibrator drove a BC547 and BC557 complementary output stage. So I had 12-V peak-to-peak square-wave = 6v AC. This I capacitively coupled to one of your piezo speakers. It looked like exactly the same model.

The multi-vibrator was tuned by adjusting the timing resistor voltage.

Driving KSN-1005A tweeter from 555 timer Simple-Voltage-Controlled-Oscillator-using-astable-multivibrator
(Mine had a 12v supply and tuned by 5 - 12v)



Driving KSN-1005A tweeter from 555 timer Media%2F778%2F778a8f48-360f-47e9-a840-59dc3b57d3fe%2FphpqfNUE6
(Complementary output pair - fed directly from the multi-vibrator collector)

The oscillator tuned between about 14kHz to 27kHz. I overloaded the transducer a little, but I had about -110dBA from it. When I switched it on the cats just ran away. I wound the frequency down until I could hear it, then up until it just disappeared and I heard nothing at all, not even any discomfort. Even Maj-Lis heard nothing at all.

The cats never went in that room.

My step-son came to visit us and he could not come in the house. And on another occasion a woodworker was particularly sarcastic and nasty to us, then he told us that he felt heavy hearing discomfort. On both occasions I wound up the frequency a bit more until there was no discomfort to our guest.

The cats never, ever entered the gillestuga. After about 18 months the room was sweet, well ventillated and renovated. I built a bar in there and we had a few nice parties. When the multi-vibrator was switched off the cats still refused to go in there, but I left it in place in case of new piss :-)

So there you have my story and the complete circuit that I used. I believe the capacitor values were a little lower, but I cannot remember what they were.

One small addition, I used to play about with a large satellite TV parabolic antenna. I used it in many experiments, such as

- Projecting the output of an 800W oven magnetron to burn grass and melt snow
- Putting a WiFi dongle at the focus and hacking into our neighbour's WiFi
- Projecting Christmas sleigh bells at low volume to annoy our neigbour (Chink, Chink, Chink, Chink, Chink, Chink, Chink, Chink 24/7)
- Projecting 16kHz at +110dBA to annoy our neighbour


I hated the neighbour. He once built a fence on OUR land, blocked my wife's car in. Called in the police, who warned us not to destroy HIS property (on our land). We went to court but we lost and had to pay his legal fees. He was a native Swede, but I was an English immigrant.


Has all this helped you with your project? Please tell us a little more about it. Hope you don't have a nasty neighbour.

BR Harry - SM0VPO

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Post by Admin on Tue Apr 02, 2019 10:32 pm

Hi Ken,
I will give you a longer reply to this in the morning. I did exactly what you wanted, about 8 years ago. It was a to deter cats from entering an open are inside the house. Worked a treat :-)

BR Harry - SM0VPO

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Post by Tracer on Tue Apr 02, 2019 2:27 am

Hello Harry,

I trust this finds you well.

I have been playing around with variable ultrasonic frequency generators using a couple of 555's, frequencies ranging between 5 kHz and 20 KHz and I would like to drive a super horn tweeter type KSN-1005a equivalent as I believe these types of Piezo speakers are far more suitable than using normal 8 ohm speakers. My research into this has proven extremely  difficult and as a hobbyist I am completely out of my depth and find the need to ask for assistance.

I would appreciate any assistance with finding a suitable drive circuit, the datasheet for the tweeter are here,               http://122.55.220.155/piezo/files/KSN-1001A-1005A-Datasheet.pdf

Regards

Ken

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