OPTOFAST-2 Assembly Sheet

• Interactive BOM

Find	Qty	Ref Des	Part Number		Find	Qty	Ref Des	Part Number
7	4	R1, R4, R7, R10	RPWR		6	4	Q1, Q2, Q3, Q4	2N3904
8	4	R2, R5, R8, R11	RDIR		12	4	U1, U2, U3, U4	4N26
9	4	R3, R6, R9, R12	RBAS		3	4	H1, H2, H3, H4	GDEM
10	4	R13, R14, R15, R16	RFST		5	2	P1, P2	CONN_01X08
11	4	R17, R18, R19, R20	RCOL

Resistor Options

• R1, R4, R7, R10 - RPWR - Power to optocoupler input Anode (+)
• R2, R5, R8, R11 - RDIR - Direct drive optocoupler input Anode (+)
• Q1-Q4 - 2N3904 - Drive transistor
• R3, R6, R9, R12 - RBAS - Transistor base drive resistor
• H1, H2, H3, H4 - GDEM - Ground Cathode directly to ground
• R13, R14, R15, R16 - RFST - Faster output resistor
• R17, R18, R19, R20 - RCOL - Output collector pull-up resistor

Tindie Options

• Input and output options

Input Drive

• 5V transistor drive
  • RPWR = 180
  • RDIR = DNP (OPEN)
  • RBAS = 10K
  • Q1-Q4 = 2N3904 installed
  • GDEM = Open
• 3.3V transistor drive
  • RPWR = 100
  • RDIR = DNP (OPEN)
  • RBAS = 10K
  • Q1-Q4 = 2N3904 installed
  • GDEM = Open
• Direct Input
  • RPWR = OPEN
  • RDIR = 180 (5V)
  • RBAS = OPEN
  • Q1-Q4 = Not installed
  • GDEM = Jumper installed

Output Pullup Resistors

• Drive output
  • RCOL = 2.2K
• Open collector
  • RCOL = OPEN

Fast option (standard)

• RFST = 20K