a nice RNG mod

[doug deeper]

and any taper pot you have on hand will work, i use lin taper pots for everything.

[fldrvr]

Wow!! thanks doug- i'm really honored that you responded to my post. Nice to meet you. I really admire your work.

[fldrvr]

Hmm... I don't have a pn2222 available-

Anyone think a 2n3415, 2n3903, or pn2369 might cut it? Just curious on opinions from the enlightened- I know that experimentation is the best course!

Thanks to all in advance!

[birt]

just try something medium gain. it'll work

[fldrvr]

Thanks for the replay, birt. However, I'm a little unsure how much "medium" gain actually is. Can you give me an idea, maybe throw some values at me?

Thanks- sorry to keep asking about this.

[brett]

Hi
I might mention that transistors don't really "have" gain in the sense that we usually use the word gain.  They work with other components to produce gain.  What you usually want to match is hFE.

As a guide:
modern transistors, class, hFE is roughly
low, 200
medium, 400
high, 800

vintage transistors
low, 50
medium, 120
high, 250

Some low and mid hFE modern transistors include the 2N2369A (70), BD139 (120 to 180), TIPs (100 to 200) and high power devices (e.g. MJE3055)
Then there's piggybacking (search) for hFE from 5 to 150
cheers

[fldrvr]

Thanks all for the comments. Really helpful stuff- I can't wait to dig into this project!

The 'Small Signal Current Gain (hFE)' reading that I'm seeing on the datasheet of the 2n4401 is from 40(min)-500(max). So, from the comments here, am i correct to assume that any transistor with 'Small Signal Gain (hFE)' that falls within the same range as the 2n4401 (40-500) ia acceptable, correct?

I'll definitely look at piggybacking too.

Thanks again!!