ZTX450 Alternative from the BC... range?

[konstantin]

Hi Everyone,

Is there any way to use a BC... range transistor instead of the ZTX450 that Nelson use for the Aleph5?
It is imposible to find any in the local stores.

Thanks

[Henrik]

No. He himself has said so, any deasent npn will do.

[Netlist]

Hi, konstantin

I can't see the ZTX450 in the Aleph5 schematic. Mr. Pass used it in the Zen-projects.
BC 337A, BC 637, BC 639, 2SD1207 will do. I think the ZTX450 was not that important. MPSA18 or substitutes BC 184, BC 413..414, BC 550, 2SC3112..13 will also do the trick.
Watch the pin out’s

Hugo

[panos29]

Agaphte Kostantine,

I used BC550c but you may need to adjust the bias manually and maybe the current gain as BC range got higher hfe than ZTX450 and MPSA18, But I have done it with BC and works perfectly after the necessary adjustments, for any additional info contact me at my email.

Regards,

Panos29@yahoo.com

[Jarno]

Hello guys,

I stripped the circuitboards of a Citation 12 but I'm still looking for some of the parts.
Does anyone of you have an idea regarding substitutions for:
MPSL01
MPSL51
IRF100 --> although I thought this part is not very critical any Mosfet which meets the specs (or betters them) is alright, is this true?

Thanks,

Jarno.

[Nickolas K.]

ztx450 exei h RS kai mporei poly eykola na sta ferei o k. Pashalidis (Atomiki).
An ta paraggeileis tha erthoyn se 2 meres.
Einai se syskeyasia twn 5 kai to kostos einai asteio.

Kali tyxh,

Nikos

[jh6you]

Originally posted by Nickolas K.
ztx450 exei h RS kai mporei poly eykola na sta ferei o k. Pashalidis (Atomiki).
An ta paraggeileis tha erthoyn se 2 meres.
Einai se syskeyasia twn 5 kai to kostos einai asteio.
Kali tyxh,
Nikos

???

I would use any NPN transistor that satisfies two conditions:

(1) Base-Emitter on voltage = about 0.66V at normal operating temperature
(2) Maximum ratings with respect to voltages and current to be suitable for the amp

JH

[Nelson Pass]

Originally posted by Jarno
Does anyone of you have an idea regarding substitutions for:
MPSL01
MPSL51
IRF100 --> although I thought this part is not very critical any Mosfet which meets the specs (or betters them) is alright, is this true?

I think you can safely use the ZTX450 and 550 parts.
As to the IRF100, a wide variety of IR parts from 100 to 250
will work as far as I know. IRF140 is just about ideal.

[Jarno]

Thanks, Nelson!

Regards,

Jarno.

[Henrik]

Originally posted by Henrik
No. He himself has said so, any deasent npn will do.

Bad day, I for shure ment yes, sooooo sorry!!
Good that others were right on track.