Single Transistor Rumble [PSP PHAT - Revision]

[FOOKz™]

Original Topic: https://www.acidmods.com/forum/index.php/topic,28797.0.html#msg209713


Schematic:

[pigoesfar]

Very interesting idea.  I don't yet see the use for it but I'm sure there are some versatile uses for this.  Also, it was done with very simple components... and for once... NOT with a PIC - LULZ

[GhoSt]

Yea I tested this out, it works, probably much more safe and reliable this way.

[FOOKz™]

Thanks for the test... BTW for future reference i test everything before i post. Not kidding.

The other circuit --> Clickity Click you posted does not work at all.

Someone was having trouble with that other circuit and it doesn't work he tried also this one but still couldn't get it to work... but only we did.

[GhoSt]

my old method works fine for me, note I have a POC of it too. Only tested on a phatty though.

POC rumble

[FOOKz™]

You have me stumped. Both mine and your original work?

I tried yours, but it doesn't work.
I tried mine, it works.
You tried yours, it works.
You tried mine, it works.
The one guy tried yours, got the same results as me.
The one guy tried mine, got the same results as me.

The only way to solve this one -- whats the transistor you used?

I used an NPN 2N2222 transistor; so did he. What about you, the same?

[GhoSt]

2n2222a, I did notice it screws up the 5v spot on your psp, but it works.

[atomicareprise]

i just like to know where the emiiter is connected..

ur diagram shows that it is connected in (-) spot in the battery and ur using 1N4001 silicon diode...

is there any other spots that i can connect it with or any ground points..

then the base is connected to speaker..is it in the (-) or the (+) and ur using 200 ohms resistor..

can you help me out..

[FOOKz™]

- Not to sure where else to connect the negative on the motherboard. (just refer to a motherboard screen shot to check where you can find a negative.)

- The base is connected to the positive end of the speaker with a 200 ohm resistor.

[atomicareprise]

- Not to sure where else to connect the negative on the motherboard. (just refer to a motherboard screen shot to check where you can find a negative.)

- The base is connected to the positive end of the speaker with a 200 ohm resistor.

so the posotive is connected on the speaker with 200 ohm resistor then the negative is connected to the ground right?


can i solder the negative to the negative point of the speaker also?

[FOOKz™]

can i solder the negative to the negative point of the speaker also?

Test Continuity of the speaker and the battery ground. In other words check if the speaker's negative is the same point as the negative battery, i just dont know the details.

- Measure resistance of the speaker battery negative to the negative of the battery, if you read 0 Ohms its the same point. If you read anything more than 4 Ohms i do not recommend grounding to your speaker.

[flasher]

Hey guys

I just can't get this working.

These are the parts I used:
- 2N2222 H331 transistor
- 220 Ohm 0.25w Carbon 1/4w Resistor 220R
- Silicon Rectifier Diode 1N4001 1A 50V DO-41 RoHS

When I use a rumble motor, the voltage is always 0.47/0.48
When I use a led, the voltage is always 3.45
Even when there's no sound. So it seems that the voltage depends on the "consumer".

Checked the emitor and collector with a DMM, so I'm sure I ain't wiring it wrong. I even used a crocodile clip as heat sink while soldering so the transistor doesn't get damaged due to the heat.

Also tried the other way of Ghost_Death, but then I don't even get any voltage at all.

So I'm guessing I need other transistors? Or could I also do this with an LM386 chip?

Sorry for my bad English btw.

[FOOKz™]

A motor is a coil... in essence its just a piece of wire wrapped around.
The motor's resistance depends on the type of current passed through it. To AC the motor will look like high resistance but to DC it would look like low resistance.

an LED looks like the same to both AC and DC.

The problem you're probably having is you may not be supplying the transistor 4 or more volts; or your diode is disabling the transistor to turn fully on.

Try this:
-remove diode and replace with a piece of wire then see what happens.

-check the audio input to the transistor, be sure you have the right polarity.

-test the circuit but with the diode on the base of your transistor. (negative end of diode connected to the base, and the positive end of the diode connected to speaker) see what happens.

Yes you can use an LM386 and you would not need other transistors.

Substitute transistors for the 2N2222:
2N3904
BC337
2N4401
BC148
ZTX649
NTE123

[flasher]

Thanks for your fast reply and explanation!

1) no voltage at all
2) connected to the positive output of the speaker
3) no voltage at all (as aspected?)

When using an LM386, could I use this diagram, or do I have to replace the resistors?
https://www.acidmods.com/forum/index.php/topic,28600.0.html

[FOOKz™]

If you use an LM386 the motor will appear to continuously rumble so you'll have to build some sort of comparator... maybe...

just try it.

[flasher]

Thanks again, I'll try.

But when replacing the diode with a wire, I was wrong, I used the wrong transistor.
The voltage  raises actually to 1.25V ans stays that way. Does that indicate something?

EDIT: It works with the LM386, but indeed, I need some sort of comparator to make it stop rumble when there's no sound. On a 2000 it would work perfectly i suppose.

EDIT 2: Bought 10 2N3904 transistors of Ebay, no need to change the resistors?

[FOOKz™]

2N2222 and 2N3904 are pretty much the same.

ut when replacing the diode with a wire, I was wrong, I used the wrong transistor.
The voltage  raises actually to 1.25V ans stays that way. Does that indicate something?

what transistor did you use that was wrong?

[flasher]

Sorry, I meant "resistor" and not "transistor".
I used an 191K instead of the 220, woopz.
No signal from the speaker was getting trough and therefore none from the 5V spot I guess.

2N2222 and 2N3904 are pretty much the same.

I tought about that too and I doubted wether I would buy no other then a 2N like the BC337 to make sure I don't have the same problem as with the 2N2222, but the 2N3904 was the fastest to arrive here so yeah..

[FOOKz™]

I used an 191K instead of the 220, woopz.

Lol nice one. 191,000 is much different than 220. What happened when you replaced it with the appropriate resistor? I'm just trying to get to the bottom of this problem

[flasher]

Lol nice one. 191,000 is much different than 220. What happened when you replaced it with the appropriate resistor? I'm just trying to get to the bottom of this problem

And I'm graceful for that
Well, when replacing the diode with a wire and using the appropriate resistor, the voltage raised, but was still continious.

[FOOKz™]

the speaker might have a DC offset voltage... maybe the PSP's motherboard is different and has trouble.

People had trouble with both circuits:
Ghost_death's circuit - [LINK]
You're having trouble with my circuit...

try Ghost_death's diagram, you have nothing to loose plus you already have all the parts needed.

[flasher]

Thanks, but I also tried that circuit and wasn't getting any voltage at all..
The 2N3904 transistors are here, going to try it with those this evening.

EDIT:

No difference with the 2N3904 transistor, I give up