Hello All,
I got this small circuit out of a toy lamp. It basically has a LED with an pot core i guess. Please check the image below.


Another view:


As per my observation,
When Power ON : The LED lights up . But after 1 second, the pot core deflects any nearby metal pieces. ANd it happens for every 1 second.

My Doubt: Since there is no uC, how the pot core is triggered to magnetize for every 1 second.

Thank you.

 

There must be more than what you are showing us to create the 1 second pulses. What is on the other end of the yellow and white wires? Are there any components oh the back of the circuit board?

 

There must be more than what you are showing us to create the 1 second pulses. What is on the other end of the yellow and white wires? Are there any components oh the back of the circuit board?

Sure. Adding more images but its just the Battery part.

 

Odd, all I see are 2 batteries, switch, coil, 2 resistors, LED, transistor? Just what did it do?

 

Did the coil have a magnet above it on some kind of string, like a pendulum?
In that case the movement of the magnet would induce a voltage in the coil and perhaps trigger the transistor to conduct briefly and repel the magnet until it swings back again.

 

What is in the center of the coil? Hard to tell from pics...

 

This is the actual working with the plastic body.
There is a tiny magnet attached to plastic leaf like piece.

 

What is in the center of the coil? Hard to tell from pics...

A tiny magnet piece hangs above it. Check the video

 

Did the coil have a magnet above it on some kind of string, like a pendulum?
In that case the movement of the magnet would induce a voltage in the coil and perhaps trigger the transistor to conduct briefly and repel the magnet until it swings back again.

It seems like that only . But i cant understand how it happens so precisely .

 

It seems like that only . But i cant understand how it happens so precisely .

What do you mean by "deflects any nearby metal pieces"?

The normal operation depends on the time constant of the pendulum. If you were to hang a little magnet from a long string above the coil, the time constant would depend on the string length.

 

Hello,

The thing is an artificial candle:
https://www.carousell.sg/p/artificial-led-candle-1012990137/
The led is for the light, the coil is to wiggle the flame.

Bertus

 

What is triggering the transistor without a capacitor? Or is that not a transistor turning the coil on and off? Yes, it is faux flickering candle. Never saw one before like that. Most use a more modern flickering LED. A piece of metal on the bottom of the plastic flame blade. Coil turns on and off displacing the metal on the end of the flame blade. Blade is supported by an axle through near its center of gravity to rotate on. Flickering effect caused by the changing angle of light from the LED reflected off the wiggling blade.

 

What is triggering the transistor without a capacitor? Or is that not a transistor turning the coil on and off? Yes, it is faux flickering candle. Never saw one before like that. Most use a more modern flickering LED.

It‘s the same circuit as the ”perpetual motion machine” desk toy. When the magnet passes the coil it induces a current which turns the transistor on powering the coil, which kicks the magnet. If it’s a simple pendulum, it will keep very accurate intervals.

 

Hello All,
I got this small circuit out of a toy lamp. It basically has a LED with an pot core i guess. Please check the image below.
View attachment 239918

Another view:
View attachment 239919

As per my observation,
When Power ON : The LED lights up . But after 1 second, the pot core deflects any nearby metal pieces. ANd it happens for every 1 second.

My Doubt: Since there is no uC, how the pot core is triggered to magnetize for every 1 second.

Thank you.

Can you read any numbers/letters on the transistor?

 

Interesting simple circuit! I was wondering if the coil charge and collapse might somehow drive the transistor switching. Interesting and novel concept (to me at least). So that would be a magnet on the end of the blade and not just a piece of iron.

 

Interesting simple circuit! I was wondering if the coil charge and collapse might somehow drive the transistor switching. Interesting and novel concept (to me at least).

They are fun. Not too hard to build and properly packaged, very “mysterious”. They can also be in a rotary configuration.

 

hi Sam
I would say its a variant on the Esaki osc, using that Inductor and reverse breakdown.

E

 

Except this one adds the capacitor...

 

It’s a variant of a Kundo clock.

hi Sam
I would say its a variant on the Esaki osc, using that Inductor and reverse breakdown.

E

It could be. Since it is a candle it might move only periodically. Looking carefully I don’t see the expected sense winding of a Kundo pendulum.

 

That's why I asked as to what was in the middle of the coil that I saw. The sketch I found just shows a magnet being moved over the coil. The magnet on the end of the flame blade isn't going to be doing a great deal of moving relatively compared to a pendulum, very short radius of swing from its axle. Is there an iron element in the center of the coil that might be moved by the magnet? Also, I keep seeing these kinds of oscillators with a capacitor (which I expected but is missing here). Balancing all of this out to make it work is quite a little feat, even as simple as it looks. I am impressed.