OSH Park
Profile for DEL
Shared projects
NorthernLynx's contact board
by
DEL.
2
layer board of
1.02x0.89
inches
(25.86x22.66
mm).
Shared on
April 1st, 2017 12:40.
Simple momentary tactile with FET relay for Yezl Y3.
BLF driver 5.6m-SRK [rev00][untested]
by
DEL.
2
layer board of
1.82x1.82
inches
(46.20x46.20
mm).
Shared on
March 16th, 2017 12:25.
BLF flashlight driver for cheap SRKs, 46 mm, 5.6 A + m
Features
- Intended for the current generation of cheap SRKs where the thermal design is not great. Maximum current can be selected up to 6 A by populating the corresponding number and type of 7135 regulators.
- Dual channel (15+1 7135)
- No OTC - Intended for memory-decay or no-memory firmware.
- R5 to eliminate unintentional Vcc boosting during PWM.
- Cell voltage read upstream of D1.
- Oversized ground ring with good thermal connection to the 7135s.
- Full size SOT-89 electrical pads for the 7135s.
- Generous 0603 pad sizes that will accept 0805 parts as well.
- Accepts Tiny13A-85 package size for MCU.
Revision changes
- New
Suggested parts list
- U1: Atmel Attiny25, SSU or SSN package
- U2-17: 7135 350 mA LED driver
- C1, C3: 10 uF, X5R or better, 0603 or 0805 (C3 is optional)
- C2: 0.1 uF, X7R, 0603
- D1: Schottky diode, 200 mA 20 V or better, 0805 or SOD323
- R1: 300 kohm, 1%, 0603
- R2: 100 kohm, 1%, 0603
- R5: 4.7 ohm, 5%, 0603
- R6: 330 ohm, 5%, 0603 (optional, to drive an indicator LED from MCU pin 3)
- R7: 330 ohm, 5%, 0603 (optional, to drive an indicator LED from MCU pin 7, do not populate R1, R2 if doing this)
- R8: 330 ohm, 5%, 0603 (this one is just a jumper,1R - 10k will work)
BLF switch board DDm-K2-SW [rev00][untested]
by
DEL.
2
layer board of
0.61x0.57
inches
(15.39x14.45
mm).
Shared on
March 11th, 2017 20:11.
Daughter board for the DDm-K2 driver board.
https://oshpark.com/shared_projects/oyuZ86Yz
The switch is a NO SMD 6.2x6.2x3.1 mm tactile type. The LEDs have 0805 footprints. Normally R1 is not populated. A jumper or small-value resistor here wires the two LEDs to be driven in parallel.
BLF driver DDm-20 [rev01][tried and tested]
by
DEL.
2
layer board of
0.82x0.82
inches
(20.73x20.75
mm).
Shared on
March 4th, 2017 21:37.
BLF flashlight driver, 20 mm, DD+m
Slight spring-side changes to adapt to a specific light.
BLF driver DDm-L4 [rev01][tried and tested]
by
DEL.
2
layer board of
0.94x0.94
inches
(23.90x23.90
mm).
Shared on
March 1st, 2017 00:28.
DD+1 alternative for the LD-34 driver, as used in the Convoy L4 and other lights.
Revision changes:
- Size fine-tuned with a host at hand
- Dual switch footprints, also accepts an SMD switch
Notes:
- Switch is Digikey part no. 679-2400-ND.