Author Topic: PUNCH - 1W amplifier  (Read 118405 times)

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tca

PUNCH - 1W amplifier
« on: September 24, 2012, 06:07:22 AM »
Hi,
 I would like to share with you my latest build. A 1W amplifier  using the TDA7052. In my opinion it sounds much better than any LM386 it has a much better frequency response (only one capacitor on the signal path). It works with batteries but preferable with 1.5V AA in series.  I usually power it with a 9V power source.



Comments, suggestions?

Cheers.
"The future is here, it's just not evenly distributed yet." -- William Gibson

deadastronaut

Re: PUNCH - 1W amplifier
« Reply #1 on: September 24, 2012, 06:19:04 AM »
cool, is it very clean?
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^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

tca

Re: PUNCH - 1W amplifier
« Reply #2 on: September 24, 2012, 06:28:00 AM »
Yes, very clean, wonderful to plug in any effect!
"The future is here, it's just not evenly distributed yet." -- William Gibson

deadastronaut

Re: PUNCH - 1W amplifier
« Reply #3 on: September 24, 2012, 07:13:32 AM »
cool, might have to knock this up as part of my grandsons xmas prezzie... (he wants a guitar) :icon_twisted:
i'm making him a spitfire distortion, so he'll be stoked with a liittle amp too..cool.

might have to whack an headphone on it too though...to keep his mum happy.. ::)
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
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^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

B Tremblay

Re: PUNCH - 1W amplifier
« Reply #4 on: September 24, 2012, 09:01:27 AM »
I just looked through my chip amp notes and found a schematic using the 7052. It appears that I found that the chip had less pleasing overdrive tones than the 386, but I was feeding it with a FET gain stage rather than a buffer. I may have been clipping the FET and the chip was innocent. I did put in a low pass filter ahead of the chip, so it must have been a little bright to my ears.

Thanks for sharing your work.
B Tremblay
runoffgroove.com

J0K3RX

Re: PUNCH - 1W amplifier
« Reply #5 on: September 24, 2012, 09:52:09 AM »
Here's another nice one and really loud 3W runs anywhere from 6v to 15v and very small...(TDA7267) I run it from 9v and it drives a 4x12 @ 8ohms and loudly!

http://www.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k8066.pdf

Sounds great with guitar!
« Last Edit: September 24, 2012, 10:05:31 AM by J0K3RX »
Doesn't matter what you did to get it... If it sounds good, then it is good!

deadastronaut

Re: PUNCH - 1W amplifier
« Reply #6 on: September 24, 2012, 10:15:34 AM »
^ 3watts...nice!

my little roland cube is 2watts and is loud enough to annoy people....so 3 is even better!...nice one. :icon_cool:
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

Mark Hammer

Re: PUNCH - 1W amplifier
« Reply #7 on: September 24, 2012, 10:37:36 AM »
I gather these chips are typically found in small plastic add-on speakers for computers or MP3 players?

John Lyons

Re: PUNCH - 1W amplifier
« Reply #8 on: September 24, 2012, 12:41:30 PM »
Have to try the punch amp, thanks for posting.

Can someone please email me the TDA7267 (Velleman kit) schematic please?
I keep getting errors trying to download it. And the one on line is tiny...
Thanks

John
Basic Audio Pedals
www.basicaudio.net/

garcho

Re: PUNCH - 1W amplifier
« Reply #9 on: September 24, 2012, 01:34:33 PM »
sent it to ya John.
"...and weird on top!"

haveyouseenhim

Re: PUNCH - 1W amplifier
« Reply #10 on: September 24, 2012, 01:59:03 PM »
this it what i made with the velleman kit. (they sell the kit at radioshack for about $20)

http://www.youtube.com/haveyouseenhim89

I'm sorry sir, we only have the regular ohms.

tca

Re: PUNCH - 1W amplifier
« Reply #11 on: September 24, 2012, 05:33:13 PM »
Just made a PCB. Going to test it tomorrow.



Cheers.
"The future is here, it's just not evenly distributed yet." -- William Gibson

tubelectron

Re: PUNCH - 1W amplifier
« Reply #12 on: September 24, 2012, 07:31:50 PM »
cool, is it very clean?
Yes, very clean, wonderful to plug in any effect!

That's a good point, indeed. I made some trials with the LM386 and none of them were satisfactory for a reasonably audible clean power on guitar, even if I noticed that the speaker had an important influence on the result - I speak about small/miniature speakers, not guitar speakers, indeed !

Here's what I tried for guitar. it wasn't interesting... nor in power, nor in tone... I also tried the Smokey amp : it was the less bad, but not worth...



Conversely, I could derive from it an excellent battery-powered stereo monitor for my PC, very good sounding and powerful, with a volume and a tone control, using 2xLM386 (= 1 per channel) :



But connecting a guitar on that monitor gives inexplicably bad results : saturation, low power output...

A+!
I apologize for my approximative english writing and understanding !
http://guilhemamplification.jimdo.com/

deadastronaut

Re: PUNCH - 1W amplifier
« Reply #13 on: September 25, 2012, 03:57:29 AM »
^ nice builds though bruno/mike..

@tca:  might be worth adding a tone control, and headphone on it too..
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

tca

Re: PUNCH - 1W amplifier
« Reply #14 on: September 25, 2012, 06:22:19 AM »
might be worth adding a tone control, and headphone on it too..

I just wanted an plug-in-and-play amp with a small part number and I usually don't play with headphones (it makes me dizzy). But a tone control could be a nice thing. I didnít also put a volume control because I use a L-Pad (8Ohm attenuater) between the amp and the speaker and this works fine as a master volume.

BTW, the LM386 does not like this L-Pad, it reacts strangely  to it, but it works great with the TDA7052.

Cheers.
« Last Edit: September 25, 2012, 10:40:19 AM by tca »
"The future is here, it's just not evenly distributed yet." -- William Gibson

tca

Re: PUNCH - 1W amplifier
« Reply #15 on: September 25, 2012, 10:27:20 AM »
@tubelectron I've made also stereo monitor for my PC but using two class A mosfet (IRF610) amplifier.



It works fine with a booster but due to the power source (9V/100mA) it is some what muddy when used with a guitar. These class A configurations works better with higher currents and higher voltages, but nevertheless it is the amp that I use to listen to music from my PC.

Cheers.

P.S.
The bulbs are  the drain load for each of the mosfet.
« Last Edit: September 25, 2012, 10:30:47 AM by tca »
"The future is here, it's just not evenly distributed yet." -- William Gibson

tca

Re: PUNCH - 1W amplifier
« Reply #16 on: September 25, 2012, 10:35:12 AM »
@tubelectron I've build a few Rubys and usually the speaker that I use is something like this double cone speaker:



Freq. range: 50 - 12.000 Hz,
Sensitivity: 90 dB, 1 W/1 m
Size: 5.25''

It is this speaker that I plug in the punch amp.

You can buy them in Portugal for about 15 eurs.

Cheers.
« Last Edit: September 25, 2012, 04:59:49 PM by tca »
"The future is here, it's just not evenly distributed yet." -- William Gibson

bancika

Re: PUNCH - 1W amplifier
« Reply #17 on: September 25, 2012, 10:55:17 AM »
that sounds expensive, you can almost get a "real" guitar speaker, like jensen mod 6 or mod 8
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tca

Re: PUNCH - 1W amplifier
« Reply #18 on: September 25, 2012, 01:49:32 PM »
that sounds expensive, you can almost get a "real" guitar speaker, like jensen mod 6 or mod 8
You are quite right, but I can't find them with that price in Portugal (or online + mail), and I do like the sound of these speakers that I just mention.

Cheers.
"The future is here, it's just not evenly distributed yet." -- William Gibson

Jaicen_solo

Re: PUNCH - 1W amplifier
« Reply #19 on: September 26, 2012, 04:27:41 AM »
I'm going to pick up one or more of these to knock up a cheap bass amp. I'll be running the output of a Bass Pod through it, so I don't need tone controls etc. Looks perfect, but any suggestions what speaker I should use?
This is very much 'bedroom' use so I don't want it to be loud, but I want to hear the lows a little more than my current ValveJnr with the 8" speaker ;)