Shared Projects by DEL

Rev00 + pick holes and sand-to-fit tabs + wider L- flood.

DDm driver for Solarstorm/Fandyfire K2 lights.

Revision changes

• Full size SOT-89 pads for the 7135
• Unmasked L+ vias, to be solder-filled

Needs the DDm-K2-SW daughter board for the tactile switch and indicator LEDs:

https://oshpark.com/shared_projects/E7YKjPjG

‘Standard’ DDm parts list, except for:

• R1 and R2 are populated if MCU pin 7 is used for cell voltage monitoring. This could, however, be done using the software-only method of Vcc vs. the internal 1.1 V reference.
• R7 is populated when re-purposing pin 7 to drive a second indicator LED, as per the stock driver.
• There is an R1 on the back of the switch board. A jumper here rewires the two indicator LEDs in parallel, both to be driven from MCU pin 3.

Simple momentary tactile with FET relay for Yezl Y3.

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)

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.