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BC848 NPN transistor equivalent

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johnstij:
Hi. Can any one suggest an alternative/equivalent to a BC848 NPN transistor.
Thanks . Ian

John Swift:
Hi Ian ,

the transistor is basically a surface mount version of the BC108
if the pcb design makes it possible ,you could try a TO92 plastic NPN transistor like a BC547 or BC548 (can try maplin for this)

otherwise try ebay , RS components or farnell for a BC848

what is the transistor used in ,and how many do you need  ?
I may have one or two SMT transistors that may work

              John

picclock:
Hi johnstij

I have some, BC848B. The B suffix is for hfe range, so if yours lacks the suffix they will be perfect. How many do you need ?

picclock

johnstij:
Hi.
Thanks for the replies.
I'm trying to control the speed of my CNC mill spindle. It runs on Mach 3 software. The circuit i found on the Mach 3 forum converts a PWM signal to analogue 0-10v DC which goes to the motor VFD.Not sure why the circuit specifies a BC848 as he uses a TO92 case transistor built on vero strip board (as I plan to)
This link takes you to the document, the circuit is on page 11,
 http://www.cjh.com.au//PWM%20Spindle%20Control%20using%20Mach3.pdf
A copy of the circuit is attached.
Thanks  Ian

johnstij:
Hi.
Just looked through my small box of transistors and found a BC107 & 107B do you think either of these are suitable.
Thanks Ian

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