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Can i get a replacement of this transistor ? Answered

Hello,
i was just messing with circuits and i found this one above in the image i really want to make this but i don't have a BF494 transistor so my question is : Is it possible to replace this transistor with any other transistor if possible please name all possible replacement you know!

Discussions

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steveastrouk

Best Answer 5 years ago

Check the Ft of the BF494 (200Mhz) and match it with what you can get locally. The BT494 is a pretty damned fast little transistor, so be careful.

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ubdussamadsteveastrouk

Answer 5 years ago

Thanks for your help but tell me what Ft stands for ? (Beause i am not well known to electronics!)

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steveastroukubdussamad

Answer 5 years ago

Ft stands for "transition frequency", and is a measure of the kind of frequencies you can expect the transistor to work at
Its a parameter on the datasheet for the transistor. Look for "High frequency" transistors.

The BC109 might be OK for you here.

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OGF2

7 weeks ago

I found it difficult to find transistor BF494. Which transistor or component can I use to replace it. Please help me out

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ajay20060

1 year ago

if i have bc 107 transistor which have different characterstic of bf494 so what change we have eo in circuit

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vikasgurlinka

2 years ago

2N3904 or 2N2222 might do you but a 2N3707 is identical to a BF494.

You can get the datasheets here:

http://www.maxim4u.com/

You can get the datasheets and the parts for less than Radio Shack here:

http://ca.mouser.com/Electronic-Components/

Mouser has a great search filter that enables you to put the parameters of a component in and it will tell you all the parts that fit.

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stoobers

2 years ago

This looks like an am receiver with fixed regeneration. if so you can use any npn "popcorn" transistor. Common examples include 2n2222 or 2n3904.

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EiadS

2 years ago

doest tl494 replace bf494

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denmarkmediana.

2 years ago

hi, what is the replacement for B1453 transistor

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ubdussamaddenmarkmediana.

Answer 2 years ago

2SC5880 from farnell will do your job. Because you need a low Ft , so i am guessing it is for some high voltage switching (60).

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farhan.ali.92351

4 years ago

Hello , i dont have a 2N2222, so is it possibloe to replace this transistor with any other transistor is possible

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Yes, for general purpose circuit BC 547 or BC 548 or bc 557 work pretty same !

Though you can show me the circuit i will tell you what to do!

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carl winterfarhan.ali.92351

Answer 4 years ago

I use BC 457 AND 458 -- NPN --- virtually the same
BC transistors are quite common ---
2n2222 have slight voltage difference ---
look up in your tables ---its all there
regards---

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farhan.ali.92351

4 years ago

Hello , i dont have a 2N2222, so is it possibloe to replace this transistor with any other transistor is possible

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iceng

5 years ago

The physical placement of the RF ( Radio Frequency ) components is CRITICAL
So is the length  of the antenna and the diameter of the four turns..

If you have a pic of this working Follow it exactly.

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