This page lists my Open Hardware electronics designs. Most newer designs have KiCad schematic, PCB-layout, and gerber-files available. Please ask if you are interested in the older designs - some may be available.

Frequency distribution amplifier


www.ohwr.org/projects/pda-8ch-fda-8ch
A 1:8 distribution amplifier for 1-10 MHz, based on LMH6702 and LMH6609 op-amps. Residual phase-noise of <-160dBc/Hz for a 10 MHz carrier.

Pulse distribution amplifier

www.ohwr.org/projects/pda-8ch-fda-8ch
A 1:8 distribution amplifier for 1PPS signals, based on the IDT5PB1108 LVCMOS clock buffer.

Isolated pulse distribution amplifier


www.anderswallin.net/2018/02/isopda-14-isolated-pulse-distribution-amplifier/
A 1:4 pulse-distribution amplifier for 1PPS with an optoisolator-input providing galvanic isolation.

RF SP8T 1+ GHz multiplexer


www.ohwr.org/projects/rf-mux-8ch
A 1:8 absorptive SP8T RF-multiplexer, with SPI interface. Based on TE HF3 relays. > 1 GHz bandwidth. The prototypes use an Arduino Due + Ethernet Shield for control.

DIY DSOXLAN

github.com/aewallin/DSOXLAN
Simple Ethernet/LAN interface card for a HP/Keysight DSOX 2000/3000 oscilloscopes.

Constant-current TEC drive

www.anderswallin.net/2014/09/tec-drive-v2/
OPA569 based constant-current driver. Drives +/-1 A constant current into a TEC based on a +/-10 V input voltage.

HVDC amp


www.anderswallin.net/2013/11/dc-bias-amplifier/
For providing +/-100 VDC bias-voltages to electrodes. Based on Apex PA340 HV op-amp.

PICDIV frequency divider

www.anderswallin.net/2016/04/picdiv-frequency-divider/
10MHz input, 1PPS output, based on Tom van Baak's picDIV code.

PID controller


www.anderswallin.net/2014/10/op-amp-pid-controller/
Simple analog op-amp based PID-controller with jumpers for selecting P/I/D gains and trimmer-potentiometers for a weighted sum of P/I/D.

  • Pulse-stretcher
  • Agilent 34901A and 34907A breakout boards
  • Pt100 tempereature measurement frontend
  • Photodiode amplifier
  • 8-channel 4th-order 60 kHz anti-alias low-pass filter
  • Optoisolator for Mesa 5i20 servocard