new module

[Haible_Juergen#Tel2743]

Hi,

last night I finished the PCB design of my next module.
It contains the Analogue Shift Register (I posted about this
before). As the ASR just has 5 jacks on the front panel, but
it needs more than half of a 10cm*16cm pcb, I decided to
add some other functions to that module. I decided to include
two voltage controllable 2-stage-envelopes.

The first one is an AD-type, which can be switched from
AD to LFO and REPEAT. LFO means that it runs free; REPEAT
means that it cycles as long as there is a gate (I.e. gated lfo).
I used a SSM2056 with R and S inputs at GND, and Gate at VCC.
It is just controlled by the trigger input. A comparator measures
when the output goes to zero (the 2056's asymptode is some
mV below zero!), to enable the cycle features.
There is a knob for Attack and Decay, plus a jack and a 3-way
switch to choose modulation of attack and/or decay time.

The second one is an AR-type, which can be switched from
AR to SLEW. The whole thing really is a VC slew limiter, built around
a LM13700. If You switch it to AR, the input is routed thru a
schmitt trigger to form a 0V/+5V gate out of any input signal.
There is a knob for Attack and Release, plus a jack and a 3-way
switch to choose modulation of attack and/or release time.

As the pcb was very highly populated now (my most dense pcb
so far), I filled the rest of the front panel with Multiples (2x4 jacks).

JH.