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/diy/ - Do It Yourself

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2602744 No.2602744 [Reply] [Original]

Any issues in this? I’m trying to make a simple amplifier with the lm386. No this is not school homework, I‘m making sure there’s no errors.
Also how do I know when to use film vs electrolytic caps? I can’t find a solid answer on the internet.

>> No.2602751
File: 748 KB, 3024x4032, 1682025834924686.jpg [View same] [iqdb] [saucenao] [google]
2602751

>>2602744
sorry about image rotation.

>> No.2602762

if you are trying to make a 9v guitar amp, good luck. got mine to work but it was really quiet. ended up just buying an amplifier board on amazon, which worked out great

>> No.2602769
File: 48 KB, 877x404, Beavis-Audio-Noisy-Cricket-Schematic.png [View same] [iqdb] [saucenao] [google]
2602769

>>2602744
Looks similar to a Noisy Cricket, which was an expanded version of the Ruby. I don't know if it'll work though, I just throw shit together. As for the the capacitors electrolytic are polarized so they only work one way and the actual guitar signal is AC so I don't know but I remember typically seeing them only in powered sections of the circuit. In this diagram the only polarized cap is on the output so you'd use an electrolytic for that and film for the others. I-ve built tons of pedals from schematics but I'm a retard when it comes to theory.

>> No.2602770
File: 58 KB, 1468x674, Ruby_Guitar_Amp_Schematic.png [View same] [iqdb] [saucenao] [google]
2602770

>>2602769
Here's the Ruby. They both have a jfet to boost the input but I don't know how necessary it is for the amp to just function, may not sound good though.

>> No.2602772
File: 128 KB, 1141x508, 1682029387307.jpg [View same] [iqdb] [saucenao] [google]
2602772

>>2602770
Just for shits and giggles this is my favorite 386 circuit.

>> No.2602861

>>2602751
˙ʍou ʇɐǝɹƃ sʞool ʇɐɥʇ 'ʎǝɥ ɥo

>> No.2602863

>>2602751
>>2602861
Kek

>> No.2602864

>>2602769
I took a lot from noisy cricket’s simplified version (Smokey tone) output and the Datasheet. (Input volume control)

Oh I understand what you mean by the caps. If it’s polarized it’s gonna be electrolytic but film for non because it’s AC
Thanks for the input

>>2602772
What does putting two lm386 in series do? 400 gain???

>>2602762
The Datasheet states that you need to bypass pins 1 and 8 to a varistor pot to make it adjustable, that could be your issue.

>> No.2602866

>>2602744
Component-wise, lm386's are super easy to set up. But in practice, you run into two major issues - ground loops, and self-oscillation.
The zobel network on the output should arrest self-oscillation (i.e. loud screeching) iirc. Also check youtube for demonstrations on proper grounding, as it's a very common problem.

>> No.2602867

>>2602866
What the fuck is a zobel network nigga speak engish

>> No.2602868

>>2602867
The parallel cap at the output Im guessing

>> No.2602901

>>2602868
idk either lol, i've only ever seen it on these things
something about phase shift leading to runaway oscillation? just do what the schematic says lmao

>> No.2602926

>>2602770
Crazily drawn, but it’s a great idea to add the functional description of each thing and what it does.

>> No.2602947

>>2602770
>>2602926
Damn I missed this. The descriptions are perfect