Shared Projects by MARLYNZ

Breakout board

• 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! :-)

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.)