-IN(1A) +IN(1B) OUT2A +IN(2A) OUT1B OUT1A EK33 Evaluation Kit APPLICABLE PARTS (SOLD SEPARATELY) PA75CX INTRODUCTION Fast, easy breadboarding of circuits using the PA75CX is possible with the EK33 PC board. Mounting holes are provided and the provision for standard banana jacks simplifies connection and testing. Components are labeled on both sides of the board for ease in probing. This kit is not suitable for PA75CC or PA75CD. A multitude of circuit configurations are possible therefore, some components may be omitted depending on the desired circuit. Figure 1: PCB Layout TOP SIDE PA75B R7 PA75A C9 C11 C8 J8 C5 C10 CR4 J7 C12 J10 J2 J9 C7 J3 J1 R9 C1 C4 J5 R8 J6 R10 3.25 C3 EVAL33 C2 J4 REV M I C R OTE C H N O LOG Y C6 COMP. SIDE EK33 -IN(1A) +IN(1B) +VS V1 -VS1 +IN(2A) 6.50 BOTTOM SIDE Apex Microtechnology Inc. Jan 2016 www.apexanalog.com All rights reserved EK33U Rev H OUT2B OUT2A R6 R5 +IN(1A) R11 R4 CR3 R12 CR1 R3 R2 R1 CR2 C10 C5 C7 GND. C8 C11 C9 CR2 R1 R2 +IN(2B) CR1 R3 -IN(2A) R12 R4 CR3 R5 R11 R6 PA35B PA35A J8 CR4 R7 C12 J10 J2 J3 J7 J1 R9 J9 C4 C1 J5 J6 R8 R10 C3 CIRCUIT SIDE J4 C2 C6 EVAL33 +IN(1A) OUT1A OUT1B +VS V1 GND -VS1 OUT2B +IN(2B) -IN(2A)EK33 Figure 2: Equivalent Schematic -IN(1A) OUT(1A) OUT(1B) -IN(2A) OUT(2A) OUT(2B) R R J5 J4 R R J10 J6 6 5 7 11 +V +V S S CR3 CR4 R R 4 10 1A 2A R R 2 12 CR1 CR2 J3 J9 1B 2B J1 J1 J2 J8 R R 3 8 -V -V S R S R 1 9 C C 4 12 C C 3 10 C C 1 5 C C 6 2 C C 7 9 -V +V +IN(1A) S GND S +IN(2A) TYPICAL COMPONENT FUNCTIONS Component Function Power Supply bypasses MUST be used for each amplifier. Usually ceramic types of .01F C1, C2, C5, C6, C7, C9 to 1.0F, as well as, 10F of capacitance per ampere of output current. R11, R5 Feedback resistors The following locations should be jumpered unless used otherwise (their most common function is listed). J3, J9 Output amp a to input amp b J2, J8 -Vs J4, J6 Connects paralleling output a to output b J5, J10 Connects feedback for amp a The following locations should be left open unless used otherwise (their most common anticipated function is listed) J1, J7 Connects -Vs to ground reference The function of all other components is up to the designers circuit needs. 2 EK33U Rev H