MINIMAL BLENDER

Opamp Version

The following is the bare minimum you need for a blender. This will prevent feedback but will not guarantee input or output impedences.

FET Version

For those who do not like opamps, or for an even simpler version, here is a FET transistor based version.

Notes

• Input cap can be larger. For guitar apps it could also be smaller.
• Input impedance is roughly the 2.2M resistors in parrallel, so 1.1M. 1M resistors would probably also work in most applications.
• Almost any FET will work. The 2N545x family tend to be low noise and transparent. A J201 may colour the sound.
• The 4.7k can be anywhere from 3.3k to 10k.
• The 10uf cap is probably overkill.

Credits

• Jack Orman for all his buffer articles.

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Last modified: Thu Apr 20 01:24:21 EDT 2006