In this small project I will show you how to make a simple adjustable constant current load. Such a gadget is useful if you want to measure the capacity of chinese. Glad to see you have arrived on this page to learn how to build a programmable constant direct current dummy load. This load will allow you to draw a set current.
Please note that this project was built ONLY using existing parts . Dave grabs a few junkbox parts and builds a useful constant current load for switch mode power supply.
There is a type of constant current load , once used for street lighting. Going back in time when electric utilities first started providing street lighting, there was a system that wired the luminaires in series instead of parallel. Each luminaire had a transformer wired in series with the hot leg, and the low side was . The schematic is shown below.
Pass devices Qand Qcarry the 3A load. Op amp U1b adjusts the gate drive to . What is the use of the transistor Q1? The circuitry around Qset the initial maximum current reference voltage.
They presumably used a dual op-amp so had no other device to use and a . Help with constant current load for. Beginner information related to constant. Meer resultaten van electronics. The constant current is implemented with a 14-bit DAC, differential amplifiers and two MOSFET transistors operated in their linear mode. Constant current , constant power and constant.
The reference is 5V, step size is approximately 305µV. Shunt resistor is two of 0. A and max current is 20A. The load can draw high currents for a short . A while back I built a simple constant current electronic load using an aluminum HDD cooler case as the heatsink. A 9V battery provides power for a constant – current source for testing AA- or AAA- size batteries.
Build this power supply circuit to produce a constant current , no matter the load. An installed compiler was not detected. Certain simulation modes, as well as host-based coder builds require that a compiler be installed.
Please install one of the supported compilers for this release as listed at: I have already installed win sdk. Have you looked closely at the power supplies for ripple? Then I noticed the ripple corresponded with a AM radio someone was playing in the background.
Them being tuned to the same station was . Input 5v-9v, TERMINAL_BLOCK_2P_ J1. Load , TERMINAL_BLOCK_2P_ J2.