OSH Park
Shared projects
TDA2822 Pocket Amp v2.0
by
Heisenbug.
2
layer board of
1.72x1.05
inches
(43.69x26.54
mm).
Shared on
February 25th, 2015 19:16.
$8.95 for 3 copies & works even if you just get “close” to the values specified here. Tested as solder practice for students.
I’m aware this IC seems to be Not Recommended for New Designs… or at least the DIP version of it. But try to find another speaker amp of 1-2W with an idle current draw in the single-digit mA range, and operates between 2-9v (or more) - I’ve yet to find another one that does all that.
Parts: [source suggestions to come]
2 small electrolytics, 4.7uF 16+v
5 large electrolytics, 470uF 6.3-16v (the one far right, above the output, can be any large size greater than the supply voltage)
4 non-polarized caps 0.1uF SMD
6 pT/H (thru-hole) resistors, 2x each of 4.7ohm, 10Kohm, and 3.3Kohm, 1/4W
LED and 4k7 SMD resistor optional - or even short the R-pads and use a 2-pin header with an LED+resistor combo cable
0.1" 3-pin headers for audio in & out, 2x3 header for off-board volume pot, and reversible 4-pin header for power in - you choose gender for all of them.
TDA2822 DIP or SOIC-8 amp IC (note DIP has higher max power rating, 1.4W total - check amazon for batches of 5-20pcs.) …Another equivalent chip is NJM2073, made by NJR/JRC (digikey’s mfg. page) as a pin-for-pin replacement.
I designed for both DIP-8 and SOIC-8 packages, so there would be no need for an SOIC adapter board when trying to assemble this project.
Mounting holes on 3 of 4 corners, grounded, spaced 1.5" long by 0.8" wide.
The last board design I uploaded/shared before I learned how to use the “smash” tool in EagleCAD. Separating the labels from the package can be a great thing if you need to move the labels in tight spaces. This design ought to be evidence enough for that fact, though I didn’t feel that improving the labels alone would warrant a re-upload.
If my labels here leave you confused, you might check out my first version, which is less visually cluttered since I left off many of the labels altogether.
NESRGB-IGR
by
borti4938.
2
layer board of
1.35x1.05
inches
(34.29x26.67
mm).
Shared on
February 25th, 2015 18:51.
Adding functionalities for viletims NESRGB-PCB
More information here: https://github.com/borti4938/NESRGB-IGR/tree/master/Normal-Version
Switch Board Display
by
uChip.
2
layer board of
1.50x2.05
inches
(38.13x52.10
mm).
Shared on
February 25th, 2015 18:31.
VU meter & control Rev B
Switch Board Slice
by
uChip.
2
layer board of
2.70x1.50
inches
(68.58x38.13
mm).
Shared on
February 25th, 2015 18:31.
Rev C
Altitude Chamber Controller v1
by
Edison517.
2
layer board of
2.41x1.76
inches
(61.24x44.73
mm).
Shared on
February 25th, 2015 15:32.
Uses Arduino Pro Mini 5v to control MOSFETS to turn solenoids and a pump on/off to control the pressure/vacuum on a cylinder.