OSH Park
Profile for SmittyHalibut
Shared projects
Dual Rail Bread Board Supply
by
SmittyHalibut.
2
layer board of
2.00x0.75
inches
(50.80x19.05
mm).
Shared on
November 29th, 2014 07:45.
Provides +/- low noise power for audio (or other dual rail supply) bread board work.
P-MOSFET PWD Shield
by
SmittyHalibut.
2
layer board of
2.71x2.11
inches
(68.73x53.47
mm).
Shared on
November 29th, 2014 07:42.
For when you need to switch the positive side of your load (common cathode) instead of the negative side (common anode). Most FET shields use N-Channel MOSFETs which switch the ground connection, assuming the positive connection is always connected to power. This shield uses P-Channel MOSFETs which switch the positive, so it’ll work with loads that have a common ground (like this aquarium light )
The input is designed to take a PCB mounted Anderson PowerPole connector, but you can solder wires directly to it just as easily.
Components are as labeled on the board:
2Ch telephone/line personal mixer
by
SmittyHalibut.
4
layer board of
3.50x1.85
inches
(88.90x46.99
mm).
Shared on
November 21st, 2014 17:13.
Connects between your computer, your desk phone “headset” port, and something like a gaming headset with headphones and a mic. Mixes the telephone audio with the Line Out from your computer then sends it through a good headphone amplifier to your headphones. Similarly, the mic on your headset is amplified as necessar y and sent to both your telephone and your computer’s Line In port. One headset , two functions. Workplace Nirvana.
Offset Attenuator v1.0
by
SmittyHalibut.
2
layer board of
2.58x0.97
inches
(65.41x24.66
mm).
Shared on
November 20th, 2014 05:07.
A 4MHz offset attenuator for radio direction finding.
Mostly based off this design with a few modifications:
- 3 position switch: Off, On (10db pad bypassed), and On with 10db pad.
- Better filtering LPF from 4MHz oscilator to mixer section, an LC instead of RC (replaced 100ohm resistor with 15uH inductor.) Should leak less RF.
The board is designed to fit into a ½" conduit pass-through box, like what you might put on the handle end of a measuring tape yagi (Google it; there are MANY plans and designs for them.)
Only parts that are “special” are:
The rest are just standard cheap-o resistors, capacitors and 1N4148 diodes, with values as labeled on the board.
Easiest way to get a hold of me is probably on Twitter: @SmittyHalibut. Shoot me a note with your experiences if you use this board! Thanks!