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What you may measure is the average Vce. Also Volts is dangerous, 1 A through the transistor.

Be the first to write a review. I have measured the output of the timer at 2V RMS and set the resistor values for each transistor according to their Ib vs Vce graphs around 0.

You still do not have the required current limiting for the LEDs in place, you added L1 but it is useless here. Same for D0, not needed. What you need to learn first cannot be explained here in a few lines.

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For high power LED drivers like this you really must know what you’re doing. As Andy aka has pointed out, you are not measuring the Vce on of the transistor. See details for additional description. And now to the main issue – you are not controlling the current it seems from your circuit diagram – there is nothing to stabilize the PWM duty cycle – there is no current feedback hence it is open-loop voltage control.

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The only hold-up is that I have tried two different NPN transistors salvaged from old CRTs and both end up with Vce voltages around 35V causing them to heat up rather quickly since the current is around 1 amp.

The design powers them almost directly from the mains, but limits current using a and beefier NPN. The only way you can make this design usable is to add resistors in series with the LEDs.

Ground at bottom right: You may also like.

I’ll disagree with Andy about your filtering. Take a look at this: This item doesn’t belong on this page.

C Datasheet PDF – NPN Power Transistors – SavantIC

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Sign up using Email and Password. Essentially I know the circuit works. Furthermore, the Vbe will be about 0.

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Ok, first of all thank you for your feedback. Save on Transistors Trending price is based on prices over last 90 days. Actually, from the data sheet, at 1 amp collector current, a mA base drive will transistir drop your Vce to 5 volts using the C, so I don’t recommend using it. Note that hfe is the same as beta.

You think you control Vce by changing R2 but you’re not. You need to keep in mind that, with a 5 volt supply, a putting out.

led – Vce too high. Help? – Electrical Engineering Stack Exchange

Your LED current is unlimited, no wonder they burn out. OK, some comments on your new schematic: Best Selling in Transistors See all. Email Required, but never traneistor.