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Offline numisNGSTopic starter
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« on: November 02, 2017, 01:18:40 pm »
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hi
ca you tell me how to replace 2n4393 with other transistor or how to use cd 4053 or ... to replace it
thanx

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Offline GoldDigger1950
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« Reply #1 on: November 02, 2017, 02:32:44 pm »
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It's an N channel JFET, low power. Any N channel JFET should work. The CD4053 has no substitute.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline numisNGSTopic starter
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« Reply #2 on: November 03, 2017, 12:50:24 pm »
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hello
thank you golddiger
1-I mean how to use cd4053 or other ic multiplexer to replace two of 2n4393 .
2-can we replace 2n4393 with bf254?

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Offline Homefire
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« Reply #3 on: November 03, 2017, 01:06:32 pm »
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   No.  BF254 is a Darlington.   You need a N Chn Fet. 

Look in here. 

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http://www.fotorele.net/pdf/polevye_tranzistory_import.pdf


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Offline numisNGSTopic starter
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« Reply #4 on: November 03, 2017, 01:16:37 pm »
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bf245 is not  a darlington .
how about 2n3819?

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Offline Homefire
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« Reply #5 on: November 03, 2017, 07:06:51 pm »
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  Yes I stand Corrected .  Not A Darlingtion..   In your post you asked about the BF254. Not a  FET.  

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http://www.datasheetbank.com/Q62702-F202-Datasheet-PDF-Siemens


The Good Ol 2n3819 will do the job if it's just switching in a PI Delay .





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