Building the Tiny Giant amp

[alltrax]

The bright cap did nothing so I socketed the 100n input cap and that was a great improvement.
I'm used to bright amps (my band amp is a Vox AC15) so I tried a few values and was very happy with 47n at full volume and 1n at low volume.
I'll put these two caps on an dpdt switch and that will do the trick 
No it's time to put all these wires and components in a nice tiny enclosure 

[bluebunny]

Cool.  Remember to make sure your speaker output jack is completely isolated from a metal enclosure and isn't connected to ground.  Then we need pictures, of course. 

[alltrax]

Sure will 

[pmac11]

Where's everyone getting the TDA7240? I can't track a local (Canadian) supplier, just stuff out of HK via ebay.

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[pmac11]

Also, a noob wuestion...but could one rig up a send/return fx loop on this kit?  If so, how?
Thanks in advance.

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[Taylor]

For an effects loop, if you're building from my PCB, you can tap the "send" from the volume knob pad number 3. Depending on what kinda stuff you might put in the loop, you may want to add an extra opamp buffer on the "return" which would be volume knob pad 2.

[pmac11]

For an effects loop, if you're building from my PCB, you can tap the "send" from the volume knob pad number 3. Depending on what kinda stuff you might put in the loop, you may want to add an extra opamp buffer on the "return" which would be volume knob pad 2.

Thank you !

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[pmac11]

For an effects loop, if you're building from my PCB, you can tap the "send" from the volume knob pad number 3. Depending on what kinda stuff you might put in the loop, you may want to add an extra opamp buffer on the "return" which would be volume knob pad 2.

Thanks again for this. Another question - is it intended that the TL072 be soldered to the PCB or mounted in a socket?

Update-- scratch that. Found it on the list of parts for the complete kit.

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[pmac11]

For an effects loop, if you're building from my PCB, you can tap the "send" from the volume knob pad number 3. Depending on what kinda stuff you might put in the loop, you may want to add an extra opamp buffer on the "return" which would be volume knob pad 2.

Thank you !

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The full kit wasn't available when I ordered, just the PCB. I've purchased all the components and am ready to build. 
Before I get underway, I'd like some clarification regarding isolating the regulator chip. I plan to use the aluminum enclosure as the heat sink...so how do I physically connect to the enclosure for heat dissipation while maintaining electric isolation?
Thanks in advance!

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[potul]

You will need a silicon pad and a washer. Something similar to this:

https://www.amazon.com/Silicone-Heatsink-Insulator-Insulating-Particles/dp/B00KV6P828



(I didn't verify if the size is the one you need)

Mat

[pmac11]

You will need a silicon pad and a washer. Something similar to this:

https://www.amazon.com/Silicone-Heatsink-Insulator-Insulating-Particles/dp/B00KV6P828



(I didn't verify if the size is the one you need)

Mat

Sweet. Thanks!

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[pmac11]

So does the Tiny Giant need a preamp with a tone control in front of it?

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[bluebunny]

No, you can plug a guitar in directly.  Having said that, I've tended to have a couple of pedals in the path.  And having said that, I'm sure I've used it naked with an acoustic too (the signal path, not me...  ).

[garcho]

the Tiny Giant already has a preamp, with sparkling clear high-impedance input - the TL072. It can be nice to hear nothing but your pickups coming out of a speaker.

[pmac11]

No, you can plug a guitar in directly.  Having said that, I've tended to have a couple of pedals in the path.  And having said that, I'm sure I've used it naked with an acoustic too (the signal path, not me...  ).

Lol, thanks!

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[pmac11]

the Tiny Giant already has a preamp, with sparkling clear high-impedance input - the TL072. It can be nice to hear nothing but your pickups coming out of a speaker.

Thanks!

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[carlosfilipe]

Nice amp.

Going to try to build a combo with an 8" bulldog from a Vox pathfinder. 

[carlosfilipe]

Hi all.

I'm trying to assemble the circuit using a breadboard,  but because of my near-zero electronics knowledge,  i'm struggling with the TL072 layout.

Can anyone tell me if Keeb's thoughts are correct?

But just for my own understanding, am I correct in thinking that the U1A part is pins 5, 6 and 7 making the U1B pins 1, 2 and 3?
I'm used to thinking of opamps as a record, "A" being the first side (1,2,3,4) and "B" being the second side. That's why I'm asking.

I can't figure out where to connect what,  because i really don't know how to identify the chip's pins in the circuit... 

Thank you for any help

Edit: I also noticed that i don't have any 2,2 ohm resistor...  Could 2,6ohm do the trick?   

[bluebunny]

Most dual opamps - like the TL072 - look the same.  Here's one image grabbed at random from Google:



The + and - (non-inverting and inverting) inputs are clearly shown for each of the opamps.

I can't imagine using 2R6 vs. 2R2 will cause any problems.  Try it out - no-one will die. 

[carlosfilipe]

Thank you for your help.

I'll try it out and see what happens.