| Electronics > Beginners |
| high voltage electronic load = resistors + NPN transistor |
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| 001:
Hi I need for simple load to test supply 400V 0-0.4A Can I use common 30V transistor load and power resistor in series? |
| ArthurDent:
You will still be connecting a 400 VDC power supply to your 30 VDC electronic load. The resistor will only limit current, expect problems |
| 001:
--- Quote from: ArthurDent on November 05, 2018, 09:00:49 pm ---You will still be connecting a 400 VDC power supply to your 30 VDC electronic load. The resistor will only limit current, expect problems --- End quote --- You misunderstood me For example can I set load for 0.5A at 30V and add 370/0.5=740 Ohm resistor in series? |
| ArthurDent:
I understood. Putting any resistor in series with your 400 VDC supply will not prevent anything you connect to the supply from seeing 400 VDC, even for a split second. If you're going to add a resistor anyway why not just use the proper value resistor (800 ohms) and remove the electronic load from possible destruction. |
| 001:
--- Quote from: ArthurDent on November 05, 2018, 09:30:30 pm ---I understood. Putting any resistor in series with your 400 VDC supply will not prevent anything you connect to the supply from seeing 400 VDC, even for a split second. If you're going to add a resistor anyway why not just use the proper value resistor (800 ohms) and remove the electronic load from possible destruction. --- End quote --- To trim load from 0 to 100% |
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