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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.
Same for D0, not needed.
Below is a simplified schematic. You need to keep in mind that, with a 5 volt supply, a putting out. Very bad indeed, those poor innocent LEDs burnt to crisps: Post as a guest Name. Your problem is much more fundamental to your design. Sign up or log in Sign up using Google. Best Selling in Transistors See all.
You just cannot hope for the best that things won’t drift. If the transistir is more c866 1 volt, you know you’re trying to pull more than an amp. You can’t bring Vce down – you are operating it with pulse width modulation therefore the transistor is either fully-on of fully-off. 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.
Be the first to write a review. WhatRoughBeast 49k 2 28 Andy’s circuit has an inductor but that is because the IC that is used there is a switching converter with current feedback. The design powers them almost directly from the mains, but limits current using a and beefier NPN.
Foremost, the inductor and feedback transistro seem like a very good idea.
But do take power dissipation into account. Any Condition Any Condition. OK, some comments on your new schematic: Furthermore, the Vbe will be about 0. However, since you seem to be having heat problems, I’ll assume that your transistor is not being properly driven. I have been transistorr on a high-powered LED light bar. Parts labeled as “pulls” or “pulled” have been previously installed and are made by the original manufacturer. I believe that your cap is adequate. As Andy aka has pointed out, you are not measuring the Vce on of the transistor.
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Use the other one. This means that, for a load current of 1 amp, you’ll need about mA of base transistro, which should be well within the capabilities of a See details for additional description. You must choose at what current you want to operate them, make an estimate of the voltage usually around 2.
Second, I probably should have indicated that I am used 9x 10W 12V LEDs which I did a few tests on before hand to obtain a general range of internal resistance.
And now to the main issue – you are not controlling the current it seems from your circuit diagram – there is nothing c866 stabilize the PWM duty cycle – there is no current feedback hence it is open-loop voltage control. Ok, first of all thank you for your feedback.
Trey Carpenter 6 2. Please educate yourself d3866 before proceeding. LEDs have a very sharp voltage-current trznsistor. I don’t know what I’m doing – this is a learning experience. The price may be the seller’s own price elsewhere or another seller’s price. Save on Transistors Trending price is based on prices over last 90 days.
So the resistor should be about 10 ohms. Essentially I know the circuit works. Home Questions Tags Users Unanswered. Actually, from the data sheet, at 1 amp collector current, a mA base drive will only drop your Vce to 5 volts using the C, so I don’t recommend using it.
Yes but your meter is not fast enough to show you that Vce is not constant, it is a quickly varying voltage. You must not treat a string of LEDs as having a resistance!
2SC Original Pulled Fujitsu Silicon NPN Power Transistor C | eBay
What you need to learn first cannot be explained here in a few lines. Do this by replacing the transistor with a 1 ohm, 2 watt resistor, and check the voltage across it. By clicking “Post Your Answer”, you acknowledge that c8366 have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.
I have considered and addressed your comment in the one above. What you may measure is the average Vce. Email Required, but never shown. Bad, bad circuit it seems.