Rpschultz13
Active member
Anyone care to compare/contrast the PPCB Mini JFET Buffer with others. It's really simple. What are it's limitations?
Wanting to add it to a True Bypass tuner.
Wanting to add it to a True Bypass tuner.
PPCB Mini JFET Buffer
- Thread starter Rpschultz13
- Start date
JTEX
Well-known member
Compared to a (good) op-amp buffer, this will have:
- less headroom (the output can't swing rail-to-rail)
- more distortion (if it matters)
- much poorer power supply rejection (if there's noise in the power, it easily makes it into the signal)
- higher output impedance
- depending on the op-amp it's compared to, it might actually draw more idle current, if it matters.
On the plus side, it might be quieter than many op amps, and maybe marginally easier to build.
- less headroom (the output can't swing rail-to-rail)
- more distortion (if it matters)
- much poorer power supply rejection (if there's noise in the power, it easily makes it into the signal)
- higher output impedance
- depending on the op-amp it's compared to, it might actually draw more idle current, if it matters.
On the plus side, it might be quieter than many op amps, and maybe marginally easier to build.
JohnnyCreepy
Member
Rpschultz13
Active member
Good read. So which version (fet or opamp) would color my tone the least?
It looks like the PPCB one I show above, is the front end of the Dr. Quack Envelop Filter.
It looks like the PPCB one I show above, is the front end of the Dr. Quack Envelop Filter.
