Author Topic: Building the Tiny Giant amp  (Read 324216 times)

carlosfilipe

Re: Building the Tiny Giant amp
« Reply #1060 on: March 08, 2019, 08:36:25 AM »
Not forgotten, but having a hard time building it.  :icon_mrgreen:

Disassembled it and trying again...
Total newbie, willing to learn.

sevrien

Re: Building the Tiny Giant amp
« Reply #1061 on: November 08, 2019, 08:31:58 AM »
Am I correct?
When using a different voltage supply than 19,5V.

I need to adjust the resistance (1K original) connected to leg 1 (adjust)of the LM338?
Perhaps a trimpot to make it a bit easier?

greetings

potul

Re: Building the Tiny Giant amp
« Reply #1062 on: November 08, 2019, 09:38:38 AM »
As far as I know you don't need to adjust anything. The adjustment is needed if you want to provide a different voltage to the circuit (output from regulator)

the voltage should be:

Vout = 1.25 (1+R2/R1) = 1.25 (1+1000/120) = 11.6666

which does not depend on Vin if you get a high enough voltage.

FYI, I'm powering mine with 12v bypassing the regulator.

tpb03

Re: Building the Tiny Giant amp
« Reply #1063 on: July 27, 2020, 06:13:01 AM »
I finally got around to putting my Tiny Giant Kit together after it sitting in its little yellow envelope for the past 8+ years. I made a mistake soldering in a resistor and borked up the pcb when I desoldered said resistor and solder stayed in the mounting hole which I couldn't remove. I truly borked up the PCB when I tried to drill out the hole!

I have a stack of perf board lying around and all the components from the original kit (including the now desoldered transistor!). I remember that Taylor said he had a perfboard layout when he was prototyping. Is this perfboard layout available? I could put together a layout myself, but I don't want to reinvent the wheel if one already exists.

Tim

« Last Edit: July 27, 2020, 06:14:43 AM by tpb03 »

bluebunny

Re: Building the Tiny Giant amp
« Reply #1064 on: July 27, 2020, 08:31:51 AM »
Welcome to the forum, Tim.

I've not seen any perf layouts, so I can't help you there.  Be aware that the amp chip has pins which don't fit on a regular 0.1" grid, so you'd need to bend half the pins to fit.  So far as dealing with a PCB hole filled with solder, just heat the pad with your soldering iron and poke though a cocktail stick while the solder's still molten.  No need for a drill.   :)
  • SUPPORTER
Ohm's Law - much like Coles Law, but with less cabbage...

PRR

Re: Building the Tiny Giant amp
« Reply #1065 on: July 27, 2020, 02:51:31 PM »
I use a steel needle to open clogged holes. Heat, poke, done. Hot solder won't stick to cold steel.

If you have only borked a few holes and traces, it is surely easier to stick with the PCB and patch-up. If a hole-pad is gone, extend the part lead or a jumper wire to the next healthy part of the trace.
  • SUPPORTER

Ben N

  • Awesome!
  • ****
  • Posts: 4280
  • Total likes: 421
  • Ben N. - really! Now Israel, once Baltimore
Re: Building the Tiny Giant amp
« Reply #1066 on: July 28, 2020, 08:01:37 AM »
I never thought this guy would turn up here.
« Last Edit: July 28, 2020, 08:05:22 AM by Ben N »

tpb03

Re: Building the Tiny Giant amp
« Reply #1067 on: July 28, 2020, 10:47:45 PM »
I never thought this guy would turn up here.


Wrong Bork!

Thanks for the tip re: using a hot needle to free up the solder pad/well. I'll see if I can salvage the PCB. If I can't I'll plan out a perfboard layout.

Thanks again
Tim

PRR

Re: Building the Tiny Giant amp
« Reply #1068 on: July 29, 2020, 12:54:33 AM »
> using a hot needle

I use a hot soldering iron and a cold steel needle.

A hot needle, if it cools a bit, will freeze solid in the hole.
  • SUPPORTER