Our mission is to bring buildable electronic designs to the DIYer
and budget audio enthusiast. As a young boy in the sixties I
waited at my mail box at the beginning of each month eagerly
anticipating all the new electronic and DIY project magazines. In
the mid 90's I started writing for several of them bringing
my own electronic articles to DIYers everywhere and now that
I'm retired that tradition continues. I hope you enjoy the
projects I'm now bringing forward in AudioXpress and other
publications.
Keep building and keep
experimenting!
Robert
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Willow
Willow is an experimental Jfet amplifier
that uses an inexpensive (read cheap!) SMD Jfet. It is the SMD
version of the well known 2N4393. What it has over the 4393 is a
greater voltage range and speed. Going up to 40 volts as opposed
to 30 volts for its through hole counterpart. You can experiment
with the PMBF4393 in a bare bones configuration and leave the
5002 out of the circuit if you like. I should have all the
schematics, BOMs and PCBs up by the end of November the
latest.
UPDATE 2/12, there is a new schematic with changes for Willow in the works.
Errors: Fig. 2 information and fig 1 info transposed.
Fig. 1 compares the OPA227 to the trace from the waveform
generator and fig. 2 shows the PMBF4393 compared to the
OPA627!
Tube
enthusiasts, a new design
for you to play with! Hopefully I'll get the design out to
the magazines before long.
Before this though I'm experimenting
with a new motor control for my vintage AR
turntable.
Here's
an updated digital pot that was in the October aX. It has 128
position. The button is a balance control. All this with only 12
precision resistors per channel. Each input (there are 4) lights
a different color LED which can be seen on the perimeter of the
case top. I built this as an interface for testing amps.(PI=
Peripheral Interface)UPDATE, PI will be in the April issue of aX.
Merlyn is a tube
headphone amp. It's under contract for Elektor Magazine.
It's named after the cat in the background picture of
Willow.11/2011