Will a 1N4454 work in place of the 1N34A in the Fox Tone Machine and Jawari ciruits?
http://www.mouser.com/search/refine.aspx?Ntt=1n34a
I'll find out in a few hours.
Looks like I cheaped out way back when I ordered parts for a bunch of projects and got the 1N4454s.
Funny how a desciion made several months ago dosn't seem well thought out now. :icon_redface:
Here is what Mouser has to say regauding the 1N34A. (Of course this text wasn't there when I ordered the 1N4454)
*********************************************************************
FROM MOUSER...
GERMANIUM DIODE
610-1N34A, a DO-7 75V 50mA Germanium Diode has been discontinued
by Central Semiconductor, and once stock has been depleted, it
will no longer be available.
The closest replacement available for this item is 610-CDSH270.
The 610-CDSH270 is specifically designed to replace Germanium
diode manufactured with 1950s technology with a product that
uses 1990s technology. Some of the advantages of this new
technology are lower forward voltage, lower leakage, faster
switching speed, and a more robust package.
The major differences between these items is shown below:
610-1N34A 610-CDSH270
Case Type DO-7 DO-35
Peak Repetitive
Reverse Voltage 75V 100V
Peak Forward
Surge Current 500mA 750mA
Power Dissipation 80mW 100mW
Reverse Current 500uA 100nA
Forward Voltage 1.0V @ 5.0mA 1.0V @ 200mA
Juntion Temperature -50 to +75 Deg C -65 to +125 Deg C
Storage Temperature -50 to +75 Deg C -65 to +150 Deg C
5-1098-28
From the Fairchild 1N4454 data sheet.
Symbol Parameter Value Units
WIV Working Inverse Voltage 50 V
IO Average Rectified Current 200 mA
IF DC Forward Current 400 mA
if Recurrent Peak Forward Current 600 mA
if(surge) Peak Forward Surge Current
Pulse width = 1.0 second 1.0 A
Pulse width = 1.0 microsecond 4.0 A
The slightly different names for the specs is confussing.
Will it work? Sure.
Will it give the same results? No.
The CDSH270 is a silicon schottky diode. The V-I curves for turn on of shottky is not the same as germanium.
The 1N4454 shows a forward voltage of 0.5V at 100uA at 25C. It's silicon. It may be shottky, can't tell from the Fairchild datasheet.
This is not to say you won't like the sound. It will do clipping. It will not be identical to a 1N34A. That may or may not be a bad thing.
Quote from: R.G. on April 14, 2007, 02:31:14 PM
Will it work? Sure.
That's all I was hoping for. Something to rule out when de-bugging.
Quote
Will it give the same results? No.
I expected that.
Quote
This is not to say you won't like the sound.
I love the sound of all my pedals. :icon_wink: :icon_redface: :icon_wink:
Thanks RG, take the rest of the afternoon off :icon_wink: