atari punk color organ

MrDEB · May 22, 2023

curious if this has ever been done or even possible.
Am playing around building an Atari Punk Console but thinking of adding LEDs that are controlled by 3 band pass filters (low, mid high)
this is for another project for grandson to drive his parents nut with the sound and amuse him with the LEDs.

rjenkinsgb · Jun 2, 2023

MrDEB said:
Here is the circuit I have been using with the IRF520 MOSFETS and it works as planned.

Those are driven from a POSITIVE going LOGIC LEVEL signal, a very different application.

The "colour organ" is an analog circuit; the rectifier outputs cannot drive a MOSFET.

Using the 2N3904 collector gives a NEGATIVE going "switch" signal out, where it is intended to drive the small LEDs.

That could drive the upside-down (Source connected to positive) P-channel version of the MOSFET circuit, as previously stated.

If you suggest anything else, don't expect a response.

MrDEB · Jun 3, 2023

if I am understanding this correctly, use a P channel Mosfet in place of the 2n3904?

MrDEB · Jun 3, 2023

I assume something like this

rjenkinsgb · Jun 3, 2023

rjenkinsgb said:
The "colour organ" is an analog circuit; the rectifier outputs cannot drive a MOSFET.

rjenkinsgb said:
Using the 2N3904 collector

rjenkinsgb said:
could drive the upside-down (Source connected to positive) P-channel version of the MOSFET circuit, as previously stated.

READ!

MrDEB · Jun 3, 2023

I hope this is correct as per your description.

MrDEB · Jun 3, 2023

looking at ordering some IRF9540 Mosfets P channels. If post # 25 is correct?

rjenkinsgb · Jun 3, 2023

You have taken out the 2N3904

You have been repeatedly told you cannot substitute a FET.

The 2N3904 MUST be in as the original circuit, with the collector of that driving the gate of the P channel MOSFET rather than directly driving the LEDS.

(You also appear to have source and drain swapped on the FET).

That's it, no more, I'm not wasting effort going around in circles forever if you will not read and follow the answers.

For The Popcorn · Jun 3, 2023

rjenkinsgb said:
That's it, no more, I'm not wasting effort going around in circles forever if you will not read and follow the answers.

Awwww. This thread is nowhere near MrDEB's 6 page forum thread average!

For The Popcorn · Jun 3, 2023

In the interest of saving everyone's sanity and to prevent undue damage to heads, walls, desktops and floors, allow me to translate. No warranties, expressed or implied.

MrDEB · Jun 3, 2023

here is what I found. similar to what is in post #29
both ideas should work?

tumbleweed · Jun 3, 2023

both ideas should work?

Only if you want to blow up the fet.

MrDEB · Jun 3, 2023

DON'T WANT TO BLOW UP THER mOSFET

MrDEB · Jun 3, 2023

Post #29 and #30 are wrong?

For The Popcorn · Jun 3, 2023

Wow. I clarify the solution from 20 posts ago that MrDEB has been steadfastly ignoring or screwing up despite many NO replies, and instead of an extremely token "thanks", he posts some piece of crap circuit he claims he found online that has the mosfet shorted across the power rails with the comment "This will be just as good?"

Please do lay out circuit boards and build that circuit. Be sure and connect it to a really beefy power supply! Then watch the sound and light show as the mosfets explode! Take video! We all want to see!

For The Popcorn · Jun 3, 2023

Here's a buck. Buy yourself a fricken' clue.

audioguru · Jun 3, 2023

MrDEB, please see that your Mosfet is upside down and is in a completely different circuit:

MrDEB · Jun 4, 2023

thanks will make corrections

MrDEB · Jun 4, 2023

are you saying both post #29 & 30 are wrong?

MrDEB · Jun 4, 2023

I think I missed the post#36

MrDEB · Jun 4, 2023

made suggested changes as per post# 29 & 36

THANKS

atari punk color organ

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