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search: solenoid puh type. My is a pull type and that´s not good for my uses, I should have bought a push type.

I just came across a flashing LED lamp project my sister did in technology class at school years ago.

It uses a cheap basic LED flasher IC (http://www.technobase.jp/eclib/OTHER/DA ... /m34xl.pdf).

I just hooked up a MOSFET power transistor instead of the LED, and it now powers a 24W 12V solenoid.

Not something I'd be using, and there are many other ways to do this, but it's a very simple and cheap way to get full auto solenoid pulsing.

The rate of blinking is fixed on each chip, and it seems them come in 1, 2, 4, and 8 pulses per second.

I just came across a flashing LED lamp project my sister did in technology class at school years ago.

Pure awesomeness!! I knew there must be a part like this

f### you the NE555 timer!!

I just hooked up a MOSFET power transistor instead of the LED, and it now powers a 24W 12V solenoid.

care to elaborate?
Updata, bigger chamber.
Only missing the firing circiut.

I was just drawing out a wiring schematic, but then I realised there is another transistor involved (as I hadn't removed it from the circuit board...).

I've found some info on the original circuit:
http://membres.multimania.fr/ysirjean/D ... Signal.pdf
Weirdly the PDF lists two identical BC 239 NPN transistors. My circuit is identical but I have an M34-2L and a... well I'm not too sure what it is; "13C 55713 R5 E" is printed on it... it may just be used as an amplifier.

Using the M34-2L on it's own is awkward, as you'd end up bypassing the mosfet when linking up the ground wires...
Here's the drawing I was doing until i realised I didn't have enough electronic smarts
If you ignore the left hand bit, that's basically how a MOSFET is wired for this application.

maybe someone more familiar with electronics can sort this out ?

Using a relay instead of the mosfet would work as the grounds would be separate.

@al-xg

The circuit you linked to is not even a flashing circuit.
It is 3 red LEDs in series driven by a NPN transistor.

I will make a schematic for you.

Keep in mind that the M34 has a fixed duty cycle and fixed frequency.
Not adjustable.

Is that a paintball tank? If so, what size is it (as in 20oz or 12oz or something)?

12oz co2 paintball tank, service pressure 124bar.
Thanks dewey-1, again

Here is the simplest method to use a M34-xx LED flasher on a solenoid.

There are several disadvantages compared to using dual 555 circuit that I have given to wyz.

Yap I know, but when I'm still trying to make the dual 555 circuit work, I need something simple to test my solenoid on my guns, also training my welding technique.

The circuit you linked to is not even a flashing circuit.
It is 3 red LEDs in series driven by a NPN transistor

I reckon the circuit I have is a modified version, someone just decided to make the LEDs flash and substituted one of the transistors, but keeping the same PCB and thereby the same name code.
The left hand side NPN transistor has been swapped for the M34-2L and the LEDs flash.


On your schematic, R2 is reducing the voltage to the opto-coupler and r3 is a pull-down resistor for the MOSFET gate ?



Haha, just got the circuit out again to have a look, plugged it in, and now the LED flash green; they used to shine red or at least orange (although some red is still visible), would that suggest they're now getting a higher voltage for some reason ?

al-xg wrote: On your schematic, R2 is reducing the voltage to the opto-coupler and r3 is a pull-down resistor for the MOSFET gate ?

That is correct.

Here is a schematic for that link that has modified circuit.