Author Topic: Pepper Spray Transistor Question  (Read 597 times)

zgrav

  • Stompbox Star
  • ***
  • Posts: 169
    • View Profile
Pepper Spray Transistor Question
« on: April 27, 2019, 11:34:23 AM »
The parts list for the Pepper Spray lists Q2 as 2n3965       I used the links in the build doc to smallbear electronics to order parts that I needed, and I just realized the link was to a 2n3565 transistor (which I ordered, and have ready for the build).     I don't see the 2n3565 listed as an equivalent for the 2n3965, but is this a recommended sub for Q2?    I wanted to check since I do find an equivalent listing for the 2n3965 to be a 2n3906, which I have in my inventory. 


brucer

  • Solder Ninja
  • ****
  • Posts: 462
  • Bruce ... R
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #1 on: April 27, 2019, 04:34:19 PM »
I think 2n3965 must be a mistake (both in BOM and schematic ...).  Effects Layouts lists it as a 2n3565 (http://effectslayouts.blogspot.com/2016/07/harmonic-percolator.html) ... do a few other places.

zgrav

  • Stompbox Star
  • ***
  • Posts: 169
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #2 on: April 27, 2019, 05:41:15 PM »
I think it probably is an error too.  I am socketing the transistors so I might give it a try anyway to see if it smokes (literally or figuratively ...).  Then I can sub in the 2n3906.

Bret608

  • Electron Doctor
  • *****
  • Posts: 1656
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #3 on: April 28, 2019, 09:22:18 AM »
It's definitely supposed to be a 2n3565 since that was confirmed by the reverse engineered units out there. That said, any medium-gain NPN silicon will work well for Q2 in the circuit.

benny_profane

  • Solder Ninja
  • ****
  • Posts: 358
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #4 on: April 28, 2019, 09:28:45 AM »
Iíve made a perc with the 2n3565 (per the schematic online) and it turned out great. I think the BOM just has a typo.

zgrav

  • Stompbox Star
  • ***
  • Posts: 169
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #5 on: April 28, 2019, 11:14:15 AM »
thanks!  checked some other schematics on the web and fuond multiple references to using the 2n3565, along with a couple of other NPN choices.

Aentons

  • Solder Ninja
  • ****
  • Posts: 437
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #6 on: May 08, 2019, 08:43:52 AM »
It's definitely supposed to be a 2n3565 since that was confirmed by the reverse engineered units out there. That said, any medium-gain NPN silicon will work well for Q2 in the circuit.

Mouser has a 2N3565 but they are $5 a pop...
https://www.mouser.com/ProductDetail/Central-Semiconductor/2N3565

So I looked up similar specs for what Mousers stocks and the PN3565 comes up and it is much cheaper. Has anyone tried it or know if it will work well?
https://www.mouser.com/ProductDetail/Central-Semiconductor/PN3565

madbean

  • Administrator
  • Electron Doctor
  • *****
  • Posts: 9212
  • Brian
    • View Profile
    • madbeanpedals
Re: Pepper Spray Transistor Question
« Reply #7 on: May 08, 2019, 08:56:21 AM »
A mistype - should be 3565. I'll correct it later today.
I own madbeanpedals (duh). I am part owner of Function F(X).

Aentons

  • Solder Ninja
  • ****
  • Posts: 437
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #8 on: May 08, 2019, 09:00:59 AM »
A mistype - should be 3565. I'll correct it later today.
Btw, I think there is another mistake in the PS BOM list where it specifies a BAT41 as a sub for the 3965. Shouldn't it be for the 1n695?
« Last Edit: May 08, 2019, 09:02:55 AM by Aentons »

Bret608

  • Electron Doctor
  • *****
  • Posts: 1656
    • View Profile
Re: Pepper Spray Transistor Question
« Reply #9 on: May 08, 2019, 09:48:32 AM »
Those PN3565 are a modern, higher-gain type compared to the original 2N3565. If you're looking for a modern substitute, you're better off with a 2n3904.

Small Bear still has 2n3565 for $1.75. Not the cheapest, but not too bad either considering you just need one.  ;)

No worries, Brian...I always want to type 3656 on this too!