LM386 Project and effects - Page 1
Forum section: electronics / projects

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 07, 2013, 04:47:00 pm
content: Hello am planning on making a bass guitar amplifier with the LM386 audio amp.The thing is that i want my project to have effects (changing the capacitor that goes from pin 1-8 with switches)But the thing is that1) i dont like to put female headers and every time i need to change the capacitor i will open the box change the cap and close it1) I want it to have leds(with that i mean that when i "activate" a capacitor an led lights up indicating that the effect has been selected and the capacitor (1000uf for example) is now ready to rockThe problem is that i tried to design a circuit to get this by using a diode but the sound is just awfull with a lot of noise.....Please help me(photos and circuit drawings comming in a bit)

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 07, 2013, 05:02:47 pm
content: Actual LM386 CircuitMy Diode Design ( I AM SOOOO SORRYYY for the design i dont have eagle on this pc)And the DataSheethttp://www.ti.com/lit/ds/symlink/lm386.pdf

author: DavidDLC
author_rank: Frequent Contributor
timestamp: April 07, 2013, 05:10:28 pm
content: One solution is to to use something like a dual rotary switch. I don't know how expensive or difficult to get those are.One part of the dual rotary switch to select the different capacitor values, the other part to turn on the LED that indicates the effect selected.David.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 07, 2013, 06:00:57 pm
content: Thank you but i feel so stupid right now i havent thought about it ... and i thing by double rotary switch one double pole double throw... right ?

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 07, 2013, 06:05:51 pm
content: Thank you but i am really confused with the poles and the throws can you please find one that can do the job athttp://www.taydaelectronics.com/thank you

author: C
author_rank: Super Contributor
timestamp: April 07, 2013, 08:18:55 pm
content: http://en.wikipedia.org/wiki/Rotary_switch

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 08, 2013, 09:16:00 am
content: Oh this kind of a switch .... but the thing is that i will have to hook up the leds and the caps together making a crappy sound ....

author: IanJ
author_rank: Unknown
timestamp: April 08, 2013, 11:49:31 am
content: Hi,What size of speaker are you using, power rating, size & freq. responce. Is it a bass amp speaker?It'll be 'clean' as long as you select everything correctly, i.e. psu, speaker, input etc. However, a single LM386 with no sign of any real EQ is never gonna give you a nice sound, especially for bass.Keep going though......it's the best way to learn.Ian.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: April 08, 2013, 05:55:15 pm
content: Hello thanks for your answer but the thing is that i use it with my speaker system for my pc with a 3.5 mm jack 15 watt rms i think...but i thinkm that a double throw single pole switch will work and i found thesehttp://www.taydaelectronics.com/rocker-switch-red-on-off-dpst-6a-250vac-panel-mount-snap-in.htmland i think they will do the job.