This is the 3537 noise and sample and hold module from Tom Gambles 3500er
module series. It provides pink and white colored noise and a sample and
For my modules i wired it with switching sockets. Both noise source outputs
are nirmalled to an internal mixer. The mixer provides an additional input
with attenuator for external voltage sources. The sum is sent to the sample
and hold circuitry.
The sample and hold needs a short trigger pulse, not a gate signal as mentioned
in the original EFM documentation. I just added a 10n cap in series with the
clock input and it works fine even with gates now...