Substitute a 1N4001 with 1N4004?

[bobbletrox]

Due to good ol' Murphy's Law my local electronics store only stocks 1N4004 diodes when the schematic I'm using (PWM) calls for a 1N4001.  Will a 4004 be ok?  What's different between the two?

[niftydog]

the difference is in the "peak repetitive reverse voltage" spec.  The 4001 is rated at 50V, the 4004 at 400V.  Should be no difference to us pedal hackers!

[bobbletrox]

Thanks!  

[brett]

As Nifty said, no difference in 99.99% of stompbox situations.
There is a difference in how much the two diodes leak reverse current (it's higher in 4001s).  The only circuit that I can think of where a difference might occur would be RG Keens Millenium 2 indicator.  There might be a delay in the LED lighting with a 4001 compared with a 4004(though I'm only speculating - the diffence may be thousandths or even millionths of a second).

Happy PWM building.