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PCB2 Engineering Design Files

PCB2 Layout top-layer
PCB2 Top-layer Layout

The PCBs were created with Eagle v9.3.2. The PCB itself is a double layer PCB with most components being SMD. Only a few capacitors, specified by Bob as being silver-mica or polyester, are through-hole.

PCB2 Schematics

The schematics consists of five sheets:

  • Sheet 1: the voltage controlled bandpass-filters
  • Sheet 2: the product-amplifiers and level set
  • Sheet 3: the relays and the digital logic
  • Sheet 4: the power-supply
  • Sheet 5: the analog interface

PCB2 Sheet 1 Schematic
PCB2 Sheet 1: voltage controlled bandpass filters

PCB2 Sheet 2 Schematic
PCB2 Sheet 2: product-amplifiers and level set

PCB2 Sheet 3 Schematic
PCB2 Sheet 3: relays and digital logic

PCB2 Sheet 4 Schematic
PCB2 Sheet 4: power-supply

PCB2 Sheet 5 Schematic
PCB2 Sheet 5: analog interface

The PCB itself is a double layer PCB with most components being SMD. Only a few capacitors, specified by Bob as being silver-mica or polyester, are through-hole.

Design-details

I named the bits from the HC595 shift-registers R01-R24, with R01 being the first bit to shift into the shift-registers. They have the following meaning:

  • R01: f=25 Hz to R10: f=200 Hz. For f=20 Hz all bits need to be 0.
  • R11: Range = 200 Hz, R12: Range = 2 kHz, R13: Range is 20 kHz. For Range = 200 kHz these bits are all 0.
  • R14: This bit is not used.
  • R15: Sensitivity < 3 %. This replaces the function of switch S5B
  • R16: Sensitivity is 0.003 %.
  • R17: Sensitivity is 0.01 %.
  • R18: Sensitivity is 0.03 %, 0.3 % or 3 %.
  • R19: Sensitivity is 0.1 %, 1 % or 10 %. Together with R16, R17 and R18, they replace the function of switch S5A.
  • R20: Input level is 1 V.
  • R21: Input level is 3 V.
  • R22: Input level is 10 V.
  • R23: Input level is 30 V.
  • R24: Input level is 100 V. Together with R20, R21, R22 and R23, they replace the function of switch S4A and S4B.

Connector CON2 is used as interface to the microcontroller board. It contains the MAIN.OUT signal and the signals for the shift-registers (SDIN, SHCP and STCP).

PCB2 also contains connector CON1. This is used as an interface to/from PCB3. It contains the following signals: FCONT (E22), ACONT (E23), E21 (QREF), E29 (DIST), E31 (AGC) and E32 (IREF).

Mounting of components and Unit-testing

Use this test-document to get a working PCB2 board: PCB2 Unit Test. Because of the complexity of the board, all components are mounted prior to unit-testing. Use this document instead of Bob Cordell's bench-testing, because operating the switches is now done by the µC control board, which is described in this document.

In order to test this PCB, a working PCB4 (µC control board) is needed. PCB4 should be connected to a host-PC with an USB-to-UART adapter, communication settings are 57600,N,8,1. See the PCB4 page for more details.

Eagle source-files

Not to be used for commercial purposes! This is the .zip file containing the Eagle source-files: PCB2 Eagle Files

Gerber-Files

This is the .zip file containing the Gerber files that were sent to JLCPCB: PCB2 Gerber Files