Author Topic: LM386 Diagram  (Read 3636 times)

Offline pspupgrade

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LM386 Diagram
« on: April 06, 2009, 12:28:12 AM »
Hi there.

Here's (yet) another circuit diagram that I just want to quickly run through with you. I'm doing the LM386 mod with a stereo effect, so I'm using two LM386s. The only thing I'm really concerned about is the resistance, as there are 6 LEDs running off the 5v source, and two of them aren't using the LM386.



Thanks in advance   :victory:
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Offline GhoSt

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Re: LM386 Diagram
« Reply #1 on: April 06, 2009, 12:55:17 AM »
can you show me the data for the leds you are planning to use, then we can caculate a apropriate resistance. you may need 100ohm+
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Offline pspupgrade

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Re: LM386 Diagram
« Reply #2 on: April 06, 2009, 01:00:55 AM »
OK, here's the data:

Quote

Technical Spec
Source Material: AlGaInP
Emitting Colour: Yellow
Emitting Wavelength (nm): 585-595
Size: 1.2 x 0.8 mm
Intensity (mcd): 60-100
Viewing Angle (deg): 120
Forward Voltage (V): 1.8-2.4
Forward Current (mA): 20-30




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Offline bustinthejustin

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Re: LM386 Diagram
« Reply #3 on: April 06, 2009, 02:11:40 PM »
For the two leds not running off an amp, you could use an 180ohm resistor and run the leds in parallel, or an 82ohm resistor and run the leds in series. As for the amps, I'm not sure because i don't know the voltage coming off of those.

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Offline GhoSt

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Re: LM386 Diagram
« Reply #4 on: April 06, 2009, 11:30:22 PM »
Running them in series would be a daft idea, basic physics tells us that the second led in the circut will be dimmer in series.
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Offline pspupgrade

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Re: LM386 Diagram
« Reply #5 on: April 11, 2009, 10:21:17 AM »
So, conclusion please?

Sorry, been away for a while
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Offline bustinthejustin

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Re: LM386 Diagram
« Reply #6 on: April 11, 2009, 07:08:05 PM »
Running them in series would be a daft idea, basic physics tells us that the second led in the circut will be dimmer in series.

You and your smartness D:



So, conclusion please?

Sorry, been away for a while

For the leds not using an amp and just solid on, use an 180ohm resistor and run the leds in parallel.

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Offline Blazinkaos

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Re: LM386 Diagram
« Reply #7 on: April 11, 2009, 10:48:50 PM »
yea its always best to use parallel on psp

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Offline pspupgrade

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Re: LM386 Diagram
« Reply #8 on: April 12, 2009, 12:09:19 AM »
Thanks again guys  :tup:.

So, in the end the diagram looks like...


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Offline Blazinkaos

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Re: LM386 Diagram
« Reply #9 on: April 12, 2009, 05:11:26 PM »
good luck man

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