Quick fix for Re:load oscillations

I’ve discovered a situation in which Re:load (both regular and epic) can generate ripple on the Device Under Test. This is only of concern to users who are using the Re:load to characterize power supplies - it won’t affect you if you are generating a load for other purposes such as testing a device’s output capability - and only occurs at voltages between 3 and 5 volts and currents over 1 amp.

Fortunately, this is easily remedied. Here’s the procedure:

  1. Cut pin 2 of the MCP6002 opamp IC.
  2. Attach a 10k resistor between pin 2 of the MCP6002 opamp and the left hand leg of the 0.05 ohm shunt resistor.
  3. Attach a capacitor of between 10nF and 100nF (0.1uF) between legs 1 and 2 of the opamp.

Here’s a photo of the completed modification:

If you think this issue might affect you and you’re not confident in making the modification yourself, please email me at [email protected], and we can arrange for return shipping, and I will perform the modification for you.

Version 2 of the Re:load, which I’m currently designing, will include the modification, as well as having several other improvements, such as a lower minimum voltage and a higher maximum voltage.