Currently, I'm working on this DIY preamplifier: https://tataylino.com/guitar-preamp-design/
Here is the circuit for it:
I wanted to know a couple of things. 1. What is the input? I am planning on connecting pedals to the input of this but I want confirmation that that is the right thing to do. In addition, what is the output? Will this plug directly into a speaker or an amplifier? If it plugs into an amplifier, could someone link me to a DIY amplifier schematic that I could use for this? I am trying to do this "as DIY as possible", so no kits or anything, I want an amplifier schematic that I can build in Altium, etc. Thank you!
Here is the circuit for it:
I wanted to know a couple of things. 1. What is the input? I am planning on connecting pedals to the input of this but I want confirmation that that is the right thing to do. In addition, what is the output? Will this plug directly into a speaker or an amplifier? If it plugs into an amplifier, could someone link me to a DIY amplifier schematic that I could use for this? I am trying to do this "as DIY as possible", so no kits or anything, I want an amplifier schematic that I can build in Altium, etc. Thank you!
It's a guitar preamp for sure, see the tone stack?
It will drive any amplifier. I suspect you're wanting to drive a 12" speaker or two (kinda like a Fender or Gibson). The real question is how loud do you want it to go, and what are you driving?
You could go tube amplifier for great tone, or solid state like a Yamaha if you want really clean and quiet.
It will drive any amplifier. I suspect you're wanting to drive a 12" speaker or two (kinda like a Fender or Gibson). The real question is how loud do you want it to go, and what are you driving?
You could go tube amplifier for great tone, or solid state like a Yamaha if you want really clean and quiet.
I want this to drive a speaker, but I know preamps on their own cannot provide a signal that can drive a speaker. I want this to output at around 70-80dB, but I cannot find any DIY power amps I can plug this into.
Actually, you don't need that much power for that level, depending on the speaker. Almost any amplifier on here should do that, many are 50 watts and up. A 14 watt tube amp should do it also (6BQ5 push-pull).
Why not start by defining your speaker? Knowing the efficiency will tell you how much power you need. Outdoors will require a lot more power than inside a room. Build a bigger amp than you think you need, the cost differential isn't much and you will probably want more power later unless this is a little practice amp. Full range guitar speakers are normally pretty efficient.
Why not start by defining your speaker? Knowing the efficiency will tell you how much power you need. Outdoors will require a lot more power than inside a room. Build a bigger amp than you think you need, the cost differential isn't much and you will probably want more power later unless this is a little practice amp. Full range guitar speakers are normally pretty efficient.
Thank you for the help. I would prefer to do a solid-state amplifier because it's a little easier, would you mind linking me to a PCB/schematic DIY amplifier project?
Well, first let me know what you're driving and how you're going to use it. We are talking about a guitar amplifier right?
Yes, a guitar amplifier. I would like to drive a 25W speaker. Now that I'm thinking about it, can I just append on to the schematic above by adding an amplifier circuit? I'm kind of just stuck on this.
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Okay, what's the efficiency of that speaker? Are you playing bass (need a big speaker then, 12" recommended)? Is it a practice amp, or will you play with it?
Yes, you can simply append the amplifier to your schematic. Build a bigger amplifier than 25 watts as the speaker will see varying levels and can take peaks.
Yes, you can simply append the amplifier to your schematic. Build a bigger amplifier than 25 watts as the speaker will see varying levels and can take peaks.
The speaker was going to be something like a Mojotone BV-25M 25W speaker
https://www.mojotone.com/British-Vintage-Series-12-BV-25M-Speaker-16-OHM-25W-1-5
https://www.mojotone.com/British-Vintage-Series-12-BV-25M-Speaker-16-OHM-25W-1-5
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C6 is generally double the value of C5.
In case you don't get the tone, look in to this first.
Regards.
In case you don't get the tone, look in to this first.
Regards.
I think that I will combine the provided schematic, with this schematic of the LM1875. Is this possible? Just so that I am able to keep everything on one PCB.
There are LM1875 boards available on ebay. There are no single supply boards, only split supply boards. +-15 at 1 A would be suitable.
You can also buy with the parts loaded, but the IC might be fake. You get real LM1875 from newark, digikey, mouser, alliedelec.
You can also buy with the parts loaded, but the IC might be fake. You get real LM1875 from newark, digikey, mouser, alliedelec.
Okay, notice it is a 16 ohm speaker? You'll need a higher voltage drive in order to get the power you expect out of it. That chip will drive it fine given a proper heat sink.
I see it's out of stock as well, but 97 dB/watt is an easy load at least. If they have an 8 ohm version you would be better with that.
I see it's out of stock as well, but 97 dB/watt is an easy load at least. If they have an 8 ohm version you would be better with that.
