I have an ECU A controlling a relay, in which when there is an activation command I can measure 12 V and 100 mA.
The project I'm working on is to replace that ECU A with an ECU B, but when I send my activation command to the relay, it is only able to draw 12 mA from ECU B due to internal limitations. The voltage I measure in that situation is 3 V, but ECU B has a voltage driving system connected to a 12 V supply.
My question is what kind of circuitry I can use to increase both the voltage and the current to reach the values I got with ECU A. I have access to a power supply of 12 V, which is the one being used for the voltage driving system. I imagine some sort of amplifier would be the necessary component, but then which type and how to determine the specs for it?
My background on electrical circuits is not very extensive, so please bear with me. I could really use your feedback. Thank you!