C Datasheet PDF – NPN Power Transistors – SavantIC, C datasheet, C pdf, C pinout, data, circuit, C equivalent. CAU5F [] – C TRANSISTOR NOS(New Old Stock ) 1PC. CAU5F PART NUMBER REPLACE PART SUMMARY. NTE – NPN Transistor, SI High-Voltage/High-Speed.

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Also Volts is dangerous, 1 A through the transistor.

C(TRANS) NTE Equivalent NTE TRANSISTOR NPN SILIC – Wholesale Electronics

Be able to make power calculations etc. Trey Carpenter 6 2. Sign up using Email and Password. Let us fix the problem for you. You can’t bring Vce down – you are operating it with pulse width modulation therefore the transistor is either fully-on of fully-off. The rule of thumb is that, when a transistor is in saturation, it has a gain of about 10 to 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.

You must choose at what current you want to operate them, make an estimate of the voltage usually around 2. As Andy aka has pointed out, you are not measuring the Vce on of the transistor.

What you may measure is the average Vce. Save on Transistors Trending price is based on prices over last 90 days. The price may be the seller’s own price elsewhere or another seller’s price. Any Condition Any Condition. Sign up using Facebook. I have considered and addressed your comment in the one above.

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If you don’t know what I’m talking about, then look it up and study it. Foremost, the inductor and feedback diode seem like a very good idea.

WhatRoughBeast 49k 2 28 Same for D0, not needed. 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.

2SC3866 Original Pulled Fujitsu Silicon NPN Power Transistor C3866

Ok, first of all thank you for your feedback. I’ll disagree with Andy about your filtering. No ratings or reviews yet.

I believe that your cap is adequate. Yes but your meter is not fast enough to show you that Vce is not constant, it is a quickly varying voltage.

Very bad indeed, those poor innocent LEDs burnt to crisps: Furthermore, the Vbe will be about 0. Note that hfe is the same as beta. Please educate yourself first before proceeding. I will link the datasheets for the two in below.

And now to the main issue – you are not controlling the current it seems from your circuit diagram – there is nothing to trqnsistor the PWM duty cycle – there is no current feedback hence it is open-loop voltage control. The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. Take a look at this: Obviously the LED resistance changes with several factors, and I have blown out transistpr few, but that was due to soldering issues on my part.


Andy’s circuit has an inductor but that is because the IC that is used there is a switching converter with current feedback. Actually, from the data sheet, at 1 amp collector current, a mA base drive x3866 only drop your Vce to 5 volts using the C, so I don’t recommend using it. LEDs have a very sharp voltage-current relation.

The design powers them almost directly from the mains, but limits current using a and beefier NPN. Bad, bad circuit it seems. OK, some comments on your new schematic: Email Required, but never shown. This is the price excluding shipping and handling fees a seller has provided at which the same item, or one that is nearly identical to it, is being offered for sale or has been offered for sale in the recent past.

Parts labeled as “pulls” trabsistor “pulled” have been previously installed and are made by the original manufacturer. It is basic electronics knowledge. Post as a guest Name. Below is a simplified schematic. Do this by replacing the transistor with a 1 ohm, 2 watt resistor, and check the voltage across it.


See details for additional description. Use the other one. Best Selling in Transistors See all.