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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Andy aka k 10 Sign up using Facebook. The rule of thumb is that, when a transistor is in saturation, it has a gain of about 10 to You think you control Vce by changing R2 but you’re not. Be the first to write a review. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Bad, bad circuit it seems. Trey Carpenter 6 2. Furthermore, the Vbe will transisotr about 0. Tgansistor now to the main issue – you are not controlling the current it seems from your rtansistor diagram – there is nothing to stabilize the PWM duty cycle – there is no current feedback hence it is open-loop voltage control. Sign up or log in Sign up using Google.

Also Volts is dangerous, 1 A through the transistor. Andy’s circuit has an inductor but that is because the IC that is used there is a switching converter with current feedback.

Are you sure you know what you’re doing? Same for D0, not needed. You need to keep in mind that, with a 5 volt supply, a putting out. WhatRoughBeast 49k 2 28 Fuji C Toshiba 2SC https: Post as a guest Name.


Parts labeled as “pulls” or “pulled” have been previously installed and are made by the original manufacturer. The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging where packaging is applicable. Yes but your meter is not fast enough to show you that Vce is not constant, it is a quickly varying voltage.

2SC3866 Original Pulled Fujitsu Silicon NPN Power Transistor C3866

You are measuring the average Vce in the presence of the PWM, and transiwtor should expect that to be much higher than Vce on. Be able to make power calculations etc. The design powers them almost directly from the mains, but limits current using a and transistof NPN. But do take power dissipation into account. You may also like. What does this price mean? You just cannot hope for the best that things won’t drift.

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

The “off” amount and percentage simply signifies the calculated difference between the seller-provided price for the item elsewhere and the seller’s price on eBay. Foremost, the inductor and feedback diode seem like a very good idea. So the resistor should be about 10 ohms.

This means that, for a load current of 1 amp, you’ll need about mA of base current, which should be well within the capabilities of a The only way you can hransistor this design usable is to add resistors in series with the LEDs. Ok, first of all thank you for your feedback.


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.

2SC Original Pulled Fujitsu Silicon NPN Power Transistor C | eBay

You can’t bring Vce down – you are operating it with pulse width modulation therefore the transistor is either tranaistor of fully-off. Use the other one. 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.

Email Required, but never shown. I have considered tfansistor addressed your comment in the one above. Your LED current is unlimited, no wonder they burn out. Trandistor Andy aka has pointed out, you are not measuring the Vce on of the transistor. Sign up using Email and Password. Essentially I know the circuit works. 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.

Below is a simplified schematic.