Incredibly-Dead watch battery 0.7 volts, power pulse motor 0,7 uA
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- Опубліковано 4 жов 2024
- I took the battery from an old clock of 0.7 volt that had stopped. Put it in my micro amp pulse motor and it rotated to my great surprise. It uses only 0.7 uAmp.
0.7 uA = 0.0000007 Amp - Наука та технологія
Remember STH851 is a NPN, so the polarity is changed . If you change the C and E the circuit don`t work. I know this is not normal. But the motor is running as you see.
Try to make one yourself and then you understand. Have a good day Larskro
shown STN is wrong connected; E can't go to +;
why R U pulling peoples legs LOL
Very interesting :) Thanks for the upload :)
GREAT JOBS. Only thing incomprehensible is the reversed polarity of power! How is that possible?
Hi,
You have the same cheap eBay digital multimeter as I have. Still... good choice. 😄😆
Fine video. Thanks for sharing. 😎
Nice motor!
+Larskro Appreciate you sharing your work and effort. I was trying to understand how your circuit works. Your schematic shows the (+) of the battery connected to the Emitter of the NPN transistor through the coil which is not typical, is this correct? I am also trying to understand how the PNP transistor is biased. I would like to replicate your circuit and would also like to know what your 15000 ohm coil was originally designed to be used for or did you wind it yourself? Thanks
Hi
The schematic should be correct and + to the emitter works. The back emf from the coil trigger the pnp.
I hope you can replicate my motor. The bearing with glass air gab and magnets is important, because of the very low friction.
This is my coil.
www.ebay.de/itm/Kloeckner-Moeller-U-MN21225-Arbeitsstromausloeser-PKZ0-380V-/152710515475
You can also use other coils from small ac 220/380 volt relays.
www.alibaba.com/product-detail/MK2P-I-380VAC-General-Relay_60187286026.html?spm=a2700.7724857.main07.128.72adfc1bhU3sov
Tell me when your motor run.
Have a good day Larskro
This relay 380 vac coil is very cheap.
www.ebay.com/itm/HH54PL-AC-380V-Coil-4PDT-Green-LED-Light-Lamp-Electromagnetic-Power-Relay-/121724383032?epid=1749440641&hash=item1c5756af38:g:w38AAOSwT6JZ1UWA
Important. Before the first run you have to balance the rotor with the 4 magnets very precise.
Hi Larskro, appreciate your information and useful links. I am still puzzled as to how the NPN transistor can be turned On to drive the coil when the battery (+) is connected to the Emitter through the coil and the battery (-) is directly connected to the Collector because this polarity would typically prevent current flow through the NPN transistor. I checked your other diagram and found that the NPN and PNP transistors are swapped when comparing your first schematic diagram a week ago and your diagram in this video. The PNP transistor was driving the coil on the diagram in your video a week ago, is this major change of swapping the NPN and PNP transistors in your circuits correct? You did not mention this NPN and PNP transistor swap in your video so I would like to confirm this swap and the transistor EBC connections with you. Thanks
Hi, In diagram 2. I have swap the polarity and the pnp / npn transistors . Because of I only have a low drop transistor STN 851 in npn to drive the coil.
The diagram 1. also work with a little higher volt min 0,8.
But remember to change C and E on transistor pnp c557c. E to the coil it is a grounded emitter. Bias current much lower.
Appreciate your response, I will plan to run some tests on this circuit when I have all the parts so that I can understand it better. Thanks
Could you please confirm this circuit requires a 40 microFarad ceramic capacitor in parallel with the battery? Also, could you recommend an alternate to C557C? Thank you.
your STN851 is wrong connected; are you doing it purposely?
Hi
See this video, how the STN851 is connected.
ua-cam.com/video/VuEU1x-tXfk/v-deo.html
This is my coil.
www.ebay.de/itm/Kloeckner-Moeller-U-MN21225-Arbeitsstromausloeser-PKZ0-380V-/152710515475
You can also use other coils from small ac 220/380 volt relays.
www.alibaba.com/product-detail/MK2P-I-380VAC-General-Relay_60187286026.html?spm=a2700.7724857.main07.128.72adfc1bhU3sov
i did not ask about coils;
and it's not clear how it connected in that linked video, but on this one the connection is wrong, or you have to change polarity of the battery;
as well your current's measurement is wrong;
by now i think your motor slowing down; you have schematic of flasher pnp-npn oscillator and it's in constant pulse mode, discharging the battery all the time
Larskro can i use a 312ohms coil?
Larskro can i use a 312ohms coil?
@@anmolkumar6704 If you use a 312ohm coil it will not work... best to find the same coil out of a microwave oven...
Very nice motor. I was curious about the measurement of the amp draw. If you were to insert your ammeter between the positive battery lead and the circuit, what would the reading be?
Thanks, Paul
Remember this is a pulse motor. You can`t see nothing on a digital multimeter without a capacitor. This capacitor has a low self discharge. I have controlled the amp with an analog meter without the capacitor and it is the same .
Interesting. In my circuit, using a digital meter, I normally measure the current as I described. I actually thought that was the "normal" way to measure amperage.
I don't understand why the current flowing through the meter would not be visible unless you had a capacitor, but my understanding of electronics is limited
what is the current record holder motor you or someone else has built.? Will stronger magnets give this motor more torque? Without torque these motors will not get beyond desk toys.