Shared projects

TRIAC1A

by MARLYNZ.
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2 layer board of 0.98x0.71 inches (24.79x17.96 mm).
Shared on November 23rd, 2014 17:20.

  • Single Triac w/ Opto driver for uC interface
  • Q1 ……… MMBT3904 (or SOT-23 equiv. )
  • Opto1 …. MOC3062 ( or DIP-6 equiv. )
  • L1,R5 …. 33uH, 33 ohm (optional RFC - use jumper wire to bypass)
  • C1,R6 …. 0.1uF/250V, 39 ohm
  • R5 …….. 10
  • R2 …….. 220
  • R1,R4 …. 1K
  • R3 …….. 3.3K
  • TO-220 Triac pads are for top-view orientation : A1-A2-Gate
  • J1 …….. 1) Gnd., 2) On/Off, 3)V+ (5-12V)
  • Note: R2 is emitter-follower. Size for desired LED drive current.
  • I.e., if driving `On/Off' with 3.3V and you want 10mA then -> (3.3 - .6(be)) / .01A = 270.
  • and… HEATSINK that triac! :-)

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4WIRE-7SEG

by MARLYNZ.
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2 layer board of 1.30x1.00 inches (33.07x25.43 mm).
Shared on September 16th, 2013 16:47.

4-cond./3.5mm to SPI 8-char. LED driver. U2=MAX7221 (or equiv.), U1=MAX9075, DD=BAS70-05, SJ-43514, C4=.1uF, R4=100K, R1-R2=10K, R3=3.3K, R5=22K. Data or Clock=High -> Load=Low. 1) Bring Data high. 2) Clock out the data. (Clock keeps Load low if all data = 0.) 3) Stop - bring both clock and data low. 4) Load goes high shortly after. Multiple displays may share the Data pin - use Clock as the unique display enable pin. (Load will go up-n-down but nothing happens if there is no clocking.)

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