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LED board with shift registers

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Store link.

PCBs are available on Tindie

While helping spreng37 with his TLC5916 project, I realized that a small board with some shift registers and some LEDs could be very useful, so I made one.

The board is 2" x 2"
Works with 3 different chips: TPIC6C595, 74HC595, and TLC5916
There are 8 3mm LEDs, but 5mm will also fit
8 current limiting resistors for 595s, which can be shorted when 5916 is used
Resistors on the header can be used to temporarily increase LED current
LEDs have separate supply, but there's Vcc jumper
Outputs are available on the header for use with external LEDs
Pull-up resistors on CLR, OE, and LE (OE and LE can be grounded with jumper)
Boards can be daisy chained
5916's resistor can be soldered in or on the header


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  • 2 weeks later...

The caps included in the kit are almost 50% smaller (10V versus 25V on the test board.)

I could include green and yellow there's an interest, but that will add another $1 to the price.

Also included in the kit are 11 shorting blocks and 3 sets of current limiting resistors: 820, 910, 1k for the 5916, and eight 82, 120, 150.

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  • 2 weeks later...

A few notes about this kit.

1. NEVER insert more than one chip. Insert only the one you want to work with.

2. CLK and SIN header labels are wrong, SIN is CLK, CLK is SIN :oops:

3. DO NOT use resistor shorting jumpers (SV1) with 74HC595 or TPIC6C595, use only with TLC5916 (constant current driver.)

4. LEDs can be supplied with higher voltage when TPIC6C595 or TLC5916 is used, use VLED pin (J1.)

5. For single supply voltage, short VLED and Vcc pins (J1.)




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One more thing, looks like PCB fab messed up the mask a little bit.
In few places, GND is exposed around pins so use very little solder (and flux) to prevent shorting, especially around current resistors and headers.
After soldering all parts, inspect visually and use small resistor to connect VLED and Vcc (just in case.)
Power the board w/o any chips, no LED should be on.

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