OSH Park
Shared projects
SDR Clock 0.28ppm
by
RA9FAF.
2
layer board of
0.99x0.83
inches
(25.02x21.01
mm).
Shared on
July 10th, 2015 16:32.
SDR LVDS 122.88 Mhz 0.28ppm Synth Clock for HiQ SDR by RA9FAF
July rf amp
by
martinlk.
4
layer board of
4.21x2.31
inches
(106.93x58.70
mm).
Shared on
July 10th, 2015 14:20.
July rf amp PCB
B-15N bias pot V1.2
by
bax.
2
layer board of
1.02x1.02
inches
(26.01x26.01
mm).
Shared on
July 10th, 2015 13:47.
Ampeg 1974 B-15N bias pot
Bourns 3250W-1-203 this is a multi-turn, 20K linear taper pot. A 25KL such as a 3296W-1-253 will work as well. The required pin spacing is 0.1".
The total target resistance with the pot and serially connected resistor is 47K ohms. The design allows for either a single or a pair of parallel resistors to be used. You can use one or two 1/2W or two 1/4W resistors. The resistor pad footprints have a 10mm pin spacing. I prefer to use metal film resistors but this is not a requirement.
Different parallel combinations of resistors can be used to attain a resistance that gets you in the desired range. There are many possibilities. For example, two 75K ohm 1/2W resistors can be used such as Vishay-Dale CMF5575K000FHEB. Alternatively a single 33K ohm 1/2W resistor such as Vishay-Dale CMF5533K200FHEK can be used. These are available from Digi-Key. It is easier to find a pair of 75K ¼W resistors with a 10mm or less pad spacing.
tinyblink-3.2.1
by
anderp.
2
layer board of
1.21x1.01
inches
(30.66x25.60
mm).
Shared on
July 10th, 2015 11:17.
minor revs & swapped LED/Button pin
STM32F042FxP6 breakout
by
2
layer board of
0.72x1.12
inches
(18.31x28.47
mm).
Shared on
July 10th, 2015 09:51.
A simple analog-friendly STM32F042FxP6 breakout board with miniUSB.