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The Inside of a Waldorf Pulse

Backside of the Waldorf Pulse PCB

Pulse backside

The only item on the backside of the PCB of the Pulse main board is the socked EPROM with the OS. I think I was very clever to put the EPROM here, because it takes only 6 screws to undo to get there. And this is something most people are able to do themself.

Waldorf Pulse PCB

PCB overview
Here is the whole Pulse electronics (except the all the sockets mounted on a little PCB in the back) on a single board.

Digital parts
the digital part

Here you see the two Motorola CPUs and the knobs. This is the digital part of the Pulse doing the Midi, the storage, the front panel and the clock for the oscillators.
Left of the LEDs you see the analog parts that create the analog waveshapes from the digital clock (= pulse, hence the name).

Analog parts

the analog part

Here you see a detail of the filter using two CA3046 transistor arrays (5 transistors each) and some of those discrete transistors. But it does not look like all those transistors visible here are used for the filter. I wonder which of those trimmers does what to the filter. The Moog Source used one of these CA3046 transistor array chips as well for the needed matched pair of transistors on top and bottom of the famous Moog ladder filter.
The OP-amps below the push-button plastic cap are the three VCAs: one for the volume and two for the panning.

all pictures © Boele "SCD" Gerkes