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Transistor Cross Over

Warlord

Jul 1, 2014
14
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Jul 1, 2014
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14
Building a Fog Horn for my light house and I need replacement transistors for a BC547 and a BC 557. I have done Google searches but but have only been slightly helpful.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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Both BC547 and BC557 are readily available.

They are jellybean components and it is unlikely they were chosen for any particular reason (other than being common).

If you have a copy of the schematic we can tell for sure, but you can try any small signal NPN and PNP transistor. A 2N3904 and 2N3906 may be suitable.
 
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