PUNCH - 1W amplifier

[allesz]

Hallo, just a few words to confirm what tca say about the tda7052.

Some times ago I posted an even simpler project on fsb, the nano amp http://www.filedropper.com/nanoamp

It was super simple but way better and cleaner sounding than the classic lm386 projects (it should be a little more powerful, so you also get some more headroom). My amp was (before a wrong polarity incident  ) my go to friend for testing circuits on the breadboard late at night, because it did not colour too much the sound.
Of course it sounded way better and brighter with a buffered pedal before, so the idea to add a buffer seems very good.

Right now I use a transistor amp with a small output transformer; it sounds good but it is almost unusable wile breadboarding because it distorts too much.

I still have a couple of tda7052 and (if I did not fry them too) I want to give a go to this project.

[tca]

Just made a PCB for the PUNCH. Enjoy.

Cheers.

EDIT: BTW, tested.

[tca]

Here is the webpage for the PUNCH.

Cheers.

[garcho]

bravo, thanks

[tca]

Just made a cabinet for the PUNCH with a 3'' speaker and using a IKEA wooden box. The rear photo shows the 9V battery enclosure.



Cheers.

[deadastronaut]

looks great...nice touch with the battery box..

[tca]

Just made a VERO version using the diy-layout-creator. Great software.



Cheers.

[deadastronaut]

hi tiago:

i breadboarded the ruby yesterday, and found its not for me...

i'll order up a couple of these TDA7052'S and try yours on breadboard too....9v-12v.

i looked in ikea for the same sturdy box you used, no joy....hmmmm...i'm sure i'll find something else suitable......eventually .

i'll try it out on breadboard and if it sounds ok, i'll build/get a speaker box and then match the EQ to suit it...

thanks for sharing man...

[tca]

Hi Rob, looking forward to hear about your build.

Cheers.

[bluebunny]

i looked in ikea for the same sturdy box you used, no joy....hmmmm...i'm sure i'll find something else suitable......eventually .

I agreed to get dragged along to IKEA on the unspoken premise that I would pick up one (or two) of these handy "mini guitar cabs".  B*ggers had discontinued it.   

[deadastronaut]

ha ha yeah i got dragged too....

[caspercody]

Stopped at Radio Shack today, and they have the 3 watt kit (K8066RS) for $9.99 (over 50% off). Not a bad price.

[rutabaga bob]

Does this have to be direct-soldered, or can an 8-pin IC socket be used?  I've seen some chips that say DO NOT use a socket.

[tca]

Does this have to be direct-soldered, or can an 8-pin IC socket be used?  I've seen some chips that say DO NOT use a socket.

I've used a socket, but you can solder it if you want to.

[chptunes]

I used a socket with the TDA7052A chip.. great clean amp for the bedroom/family room.

[rutabaga bob]

Thanks to you both!  This is on my list of projects...thinking of putting a valvecaster on the front end.  Larry

[tca]

I used a socket with the TDA7052A chip.. great clean amp for the bedroom/family room.

The TDA7052 has more gain, requires a more tolerant wife/family.

Cheers.

[rutabaga bob]

Forgot to ask: the 7052 is the only chip available in my area.  For a volume control, should I just wire in a pre-gain pot?

[tca]

Forgot to ask: the 7052 is the only chip available in my area.  For a volume control, should I just wire in a pre-gain pot?

A 10k pot between the buffer and the chip, one lug to buffer, the other to ground and wiper to chip, that should work.

[petey twofinger]

i see there is a tda7052 a than has a volume lug on the chip as well .

DC volume control
Few external components
Mute mode
Thermal protection
Short-circuit proof
No switch-on and off clicks
Good overall stability
Low power consumption
Frightens house pets
Low HF radiation
ESD protected on all pins

you run the pot from ground to pin 4 . i wonder what the benifit of this design is . oh well , i ordered 5 so i guess i will never know unless i bought the normal ones and a/b'ed em .

my goal is to do a simple fuzz circuit and house them both in the amp chassis . tried this with an lm386 and it howls like mad .
Frightens house pets