NewYorkDave
Well-known member
My favorite TO-92 bipolars. Cheap, common, and gutsy! :grin: I keep fistfuls of them on hand.
Jung Super Buffer
- Thread starter AMZ-FX
- Start date
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jdiamantis
Well-known member
....and VERY low noise! Even more so than "low noise" types.
:thumb:
:thumb:
>> I use 2N4401 and 2N4403's. Cheap and cheerful.
> ...and VERY low noise! Even more so than "low noise" types.
Low noise in low-impedance circuits.
And many audio circuits are low-Z enough to use 2N440x.
When you really have a hi-Z circuit, like the wiper of a 1Meg volume pot, the smaller high-Beta transistors will give slightly lower noise. Most of thos "lo-noise" parts got the designation 30 years ago, when hi-Z circuits were a real problem for transistors. AFAICT, around 1K there was never much of a problem, not after we got clean Silicon in the late 1960s.
Phono cartridges (moving magnet) are sorta in-between. They are under 1K over much of the audio band, but will peak up to 3K to 30K at the top of the band. Good phono preamps have been built with both types of devices. Same seems to be true for guitar inputs and mike-transformer inputs.
> ...and VERY low noise! Even more so than "low noise" types.
Low noise in low-impedance circuits.
And many audio circuits are low-Z enough to use 2N440x.
When you really have a hi-Z circuit, like the wiper of a 1Meg volume pot, the smaller high-Beta transistors will give slightly lower noise. Most of thos "lo-noise" parts got the designation 30 years ago, when hi-Z circuits were a real problem for transistors. AFAICT, around 1K there was never much of a problem, not after we got clean Silicon in the late 1960s.
Phono cartridges (moving magnet) are sorta in-between. They are under 1K over much of the audio band, but will peak up to 3K to 30K at the top of the band. Good phono preamps have been built with both types of devices. Same seems to be true for guitar inputs and mike-transformer inputs.
AMZ-FX
Well-known member
There seems to have been a lot of concern about the small surface mount parts. I took another look at the pcb last night and it could be reworked to use all through-hole parts by standing the resistors on end. I'll make up a revised pcb and see how it looks.
regards, Jack
regards, Jack
clintrubber
Well-known member
That'd be great ! :thumb: (or should I simply admit I'm too lazy to get me new contact lenses)
peranders
Well-known member
[quote author="AMZ-FX"]There seems to have been a lot of concern about the small surface mount parts. I took another look at the pcb last night and it could be reworked to use all through-hole parts by standing the resistors on end. I'll make up a revised pcb and see how it looks.
regards, Jack[/quote]
It's pretty easy to get a holemouted diamond buffer to work. Have you checked my holemounted one in my headphone amp?
Diamond buffer in a headphone amp
regards, Jack[/quote]
It's pretty easy to get a holemouted diamond buffer to work. Have you checked my holemounted one in my headphone amp?
Diamond buffer in a headphone amp
peranders
Well-known member
It has gone a couple of years and now I have made a pcb which is almost half the size since I have parts on both sides and use a 4-layer board.
The picture below shows the pattern on the "solder side".
The picture below shows the pattern on the "solder side".
Kev
Well-known member
small
grab the magnifier
8)
grab the magnifier
8)
