resistors help..

[rx5]

HI all,

 any  links to resistor info??

wanna know what other types there are and how they look, there characteristics, niose,etc.......etc......  


 thanks....

-Ralph

[Peter Snowberg]

Hi Ralph,

Here are a couple to start you off:
http://www.aikenamps.com/ResistorNoise.htm
http://www.angela.com/catalog/resistors/Resistors.html

Take care,
-Peter

[rx5]

Wow....

:wink:
those were very nice links, Peter....

 another, any general info bout differences of Silicon and Germanium transistors??

I know for a fact that Silicons have no? leakage as compared to Ge's with so much leakage...etc...etc... hope you could help me with this one too      :wink:


Regards..


-Ralph

[Peter Snowberg]

This is only the absolute basics....

Both types do leak, but the leakage of silicon transistors is much much less and the characteristics are much more consistant.

Most (maybe all) germanium transistors are built with a symmetical geometry (equal reverse breakdown on base-emitter and base-collector). In silicon trannies the base-emitter junction is usually optimized in order to get high gain which has the side effect of giving it a much lower reverse breakdown voltage than the base-collector junction.

Ge units are VERY sensative to heat where as Si units are much much less so.

The forward voltage of Ge is about 0.3V while the forward voltage of Si is a little over 0.5V.

When the forward voltage is reached in silicon, the current goes from stopped to flowing very suddenly. In germanium, the power starts to flow a little and then a lot as you hit the forward voltage.

And finally... when they saturate, silicon transistors hit the top of their headroom and stop amplifing very suddenly, this response generates more odd and higher order harmonics. Germanium transistors loose gain much more gradually as they run out of headroom. This is why they have a more warm or mellow sound when pushed into saturation (such as in a a fuzzface). They make more even and lower order harmonics.

Anyway... that should get you started.

Take care,
-Peter

[rx5]

Well explained Peter  :wink:

guess Ge tranny's sound like TUBES..  :?:

Even with just 1 Ge on the FF mean a big diff in sound compared to an FF with both Si for Q1 and Q2.....

thanks again man.... you da great!!!!