This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, February 13, 2018

1 Watt Mini Amp

Here's a nice little solid state amp for headphone use or a small 4Ω speaker. Good candidate for a bench top amp for testing purposes. You can board mount the pot and it will fit in a 1590A just fine.

33 comments:

  1. This is rad. I don’t have any TDA7052A’s. And they are a little obsolete, or I didn’t find them easily from my favorite sources. I did find a number of them on eBay. I was also unable to find a direct replacement. So, it’s to eBay if anyone needs IC’s.

    I think I’ll add this to a Wampler Tweed 57 and try and make a little solid state tweed headphone amp.

    ReplyDelete
    Replies
    1. I was wondering just the same but I want to do a amp with a a medium speaker like 8 inches, and put another preamp for switch between clean signal and tweed (od) signal before the amp, what do you think? This would be sound cool or just to quiet? You think I need another layout of amp like 10 watt?

      Delete
  2. What do you think is this better than the ROG Ruby?

    ReplyDelete
    Replies
    1. Not better, just a different option.

      Delete
    2. How many inches is the speaker size, and how many watts is the maximum

      Delete
  3. Replies
    1. You can use it with 8 ohm load, since it's a typical working condition, according to 7052A datasheet.
      I'm not quite sure why author says output is rated for 4 ohm load.

      Delete
    2. Cuz it's what the schematic said. I didn't look at the chip's datasheet :D lol

      Delete
    3. Oh, I'm not blaming you, kind sir. I was talking about schematics' author.
      :-)

      Delete
  4. Hi! Simple and nice sounding! But it works without power connection to the D of the transistor. Its normall?

    ReplyDelete
    Replies
    1. That's weird... The JFET is an input buffer, so it would work (just not as well) without it.

      Delete
  5. i put a jumper instead of G and S of the transistor and it works too. :O

    ReplyDelete
  6. Which component do I have to change to use a larger speaker?

    ReplyDelete
  7. Verified!
    I used a 8 ohm 2w speaker, and a stereo jack with a switch to use the headphones and cut the speaker.
    The sound is very transparent and defined, when using other mini amps like the ruby or the MXR could not notice great difference in the sound of the guitar when using the pot of the tone, with this, it is noticed all the variations of tone, and the selection of the pickups with great detail.
    I will abandon the MXR and start using this.
    Thanks for your dedication and talent to this site, I hope you continue for a long time!

    ReplyDelete
  8. Hey. Built it acc. to layout. Got two things happenening.
    1- the signal is getting distorted but like two signals together, one clean signal and the other is the fuzz added signal.
    2- the ic is heating like a barbeque... is that smth to be expected ?

    ReplyDelete
  9. How would this work with a celestion greenback, 25w speaker?

    ReplyDelete
    Replies
    1. This comment has been removed by the author.

      Delete
    2. It's better to use a tiny giant amp output 20 watt tagboard effect

      Delete
  10. Is out + the tip of outputjack and out - ground on outputjack??

    ReplyDelete
  11. Replies
    1. No. You'll be using a regular mono jack. Positive to the tip, and negative to the ring. You'll use that to connect to a speaker, which should have it's positive lead wired to the tip and negative lead to the sleeve of a similar mono jack.

      Delete
    2. I've just built The amp with a tda7052b and a 2n5458. Works awesome!! As i am a newby, i am struglling to make The output stereo for headphones using. I am not shure what to do in terms of impedance. Anyone has a clue??
      And thanks so much for the schematic!!!

      Delete
    3. I did it!! I just had to assemble The + on tip and - out on The second part of the tip! Done!!

      Delete
  12. thank you very much for sharing your hard work, time and knowledge. this is the best site i've ever seen in my life, definitely.

    I built this amplifier, and it works very well, except that the 47k resistor should be changed to 4.7k. It sounds much louder and better after this change.

    tested transistors:
    BF247a - very clean, small gain.
    J112 - much more gain and definition than BF247

    I wish you all the best in the upcoming new year. Take care man!

    ReplyDelete
  13. How many inches is the speaker size, and how many watts is the maximum

    ReplyDelete
  14. It's better to use a tiny giant amp output 20 watt tagboard effect

    ReplyDelete
  15. Can i use tda2030 instead of tda7052a ?? I cannot find this any alterntives??

    ReplyDelete
  16. Can I combine it with an amp emulator in the prev? for have equalization and gain control. Like input jack to a in of amp emulator (like super lot, angry charlie or other) out amp emulator to in of amp. Sorry for the bad english.

    ReplyDelete