The 208 Hub
The Hub makes it possible to plug 3 cards side-by-side
to a 208 or Easel, or even up to 6 thanks the rear
edge connector of the ToolBox series cards.
with any existing card or expander
thick 4-layer PCB for best stability and rigidity
stackable gold plated banana plugs to access the
panel banana sockets used for mounting
plated transfer card
plug and play design
- 2 power
Passive Hub : the Hub's power rails are
connected to the 208/Easel's +/- 15V rails. Most
PSUs (BEMI/Buchla USA, 211r, Meanwell PD2515)
should be able to power 3 cards or more this way.
Powered Hub : an optional +/-15V PSU is
added to the Hub to avoid extra load on the
Easel's internal PSU. This solution is mostly
intended for the early BEMI Easels with a weak
internal PSU, the Hub daisy chains off the power
brick supplied with the BEMI Easel so there is no
extra wall outlet needed.
If you don't know which PSU is inside your Easel,
this simple test is a good indicator : insert -
vertically, not at an angle, to avoid a short in
the contacts - a card such as the 208 ToolBox or
VCS3 Card, if the Easel's oscillators pitch
changes, the PSU is weak and a powered Hub is
A powered Hub can be used in any configuration and
accepts DC input from 9V to 36V.
There are 3 revisions of the Hub to
match each 208 revision's own holes placement :
208e (BEMI and Buchla USA)
208c / Easel Command (Buchla USA)
208p, 208r, original 70s 208
Please select the one that fits your own Easel or
208 exact type.
a pre-built Hub,
the price is 240€ (+75€ if the power option is
required), VAT and shipping not included.
It comes ready to use with the edge connectors
soldered, golden banana plugs and transfer card. To
avoid travel damage, the banana plugs are not
installed, installation is straightforward and no tool
PCB sets and kits
are available from
I no longer
sell retail PCB sets
myself but you're welcome
to contact me
for orders of 10
sets or more.
Bom and build notes