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Messages - slimjohnny

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Schematics and Layouts / Re: Does A500 mean 500 ohms or 500k ohm
« on: October 11, 2019, 07:11:19 PM »
Thank you!

Schematics and Layouts / Re: Does A500 mean 500 ohms or 500k ohm
« on: October 11, 2019, 01:50:15 PM »
Thank you for your advice.

So you think they meant 500 ohm in the scheamatic?

Schematics and Layouts / Does A500 mean 500 ohms or 500k ohm
« on: October 11, 2019, 12:50:33 PM »
I found this cool preamp schematic that i would like to replicate

But I don't know if the bass pot means 500 ohm or 500k because I didn't find 500 ohm log pots on ebay.
The mid and treble both have the K, so why wouldn't they put it in the bass one as well.

Thanks for the quick reply, how exactly would you move VR1 to the output?
And, although it may be unnecessary, how would you add the mid pot(i'm still unsure if I add it or not)

Edit: I just now noticed that this tone control system works differently than the marshall or fender ones, so never mind the mid pot

I found this preamp circuit for a 30W solid state amp I want to build. The only problem is that it only has a 2 band tone control(bass and treble) and I would like to make it a 3 band tone control, the other problem is that it only has one gain knob,( they call it gain in the website but I'm not sure of they mean overdrive or just volume). Anyways I would like to have a volume and a distortion knob.

Here's the link to the circuit:

How would I make these changes?

Preamps and Effects / Thanks
« on: September 11, 2019, 06:01:57 AM »
Yeah that makes sense, thank you for your reply it really cleared up things for me.

Preamps and Effects / It's the Marshall mg15cdr
« on: September 11, 2019, 04:38:57 AM »
That's the preamp section of the amp, and to the right are the two ics.

Do all amps have this?, and why?

Preamps and Effects / Do you need a low pass filter in your amp?
« on: September 10, 2019, 02:39:05 PM »
First off i'm a guitar (and amp for that matter) noob.

So i'm making a 30 watt solid state combo as my first amp and i've checked a lot of diy schematics and that gave me an idea on how mine is going to look like. All the schematics i saw were similar, preamp with tone controls and the poweramp. But then i started looking into schematics from marshall and the preamp had more two ICs than the other diy circuits so i did some research and those two IC's behave as a low pass filter.

Now that got me thinking: is the low pass filter really necessary when you already have controls over the frequecy(eq)?. Is it normal for amps to have this? And why did none of the diy schematics that i saw have this low pass filter?

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