connections only afterwards. The inductor is a 10cm piece of wire, make 10 turns around a
small screwdriver or similar, and take care that the windings are not touching each other.
Simply solder this on top of the output resistor.
Mounting onto the Paradise PCB
First, remove Q99 and Q91 from the original buffer. This deactivates it, no need to remove
the rest, but you can if you want to. The new buffer will connect to the „RIAA EXT“
connector, the „+18“ and „-18“ jumpers at the shunt, and the 4.7ohm resistor from the
original output buffer (output side). You may want to solder 5cm of some flexible cable to
each of these points now.
When you used 15mm threaded bolts, the PCB should fit nicely on top of the Paradise
PCB. The suggestion is to use Super-Glue to glue the bolts to the Paradise PCB for
mechanical fixing. Then solder the cables to the right places, in case there should be
trouble with the buffer, it can later be removed by opening the screws and desoldering the
cables.
The buffer will use about 30mA per supply voltage, and the shunt regulator has absolutely
no trouble with this. The rule of thumb however is that the shunt should consume about as
much current as the load, so the current source of the regulator should deliver a touch
more current. This is not strictly required, as said (and it works just perfect in my system),
but for the perfectionists out there, you may want to reduce the 10Ohm power resistor in
the current source to 8.2Ohm.
Adjustments
The new buffer has adjustable offset, and should be adjusted to zero. For this, simply
connect a multimeter between the „IN“ and „OUT“ connections, and adjust the trimpot to
zero. That's it folks!