Doepfer A-152 Volt.Addr.T and H/Switch
Doepfer A-152 Volt.Addr.T and H/Switch is a bit hard to understand if you don't break it down to a simple idea: it is nothing different from a remote control of any device, but here you can "switch between the channels" by means of voltages. On top of that, any switching to any channel outputs the switch signal itself as a digital output, so you can trigger different envelopes or LFO's by switching. The module further distributes a CV signal added to the common T&H input is switched around between the different T&H outputs.
Availability: Limited stock
Ships Monday, March 26 if ordered in the next 2 days, 10 hours and 50 minutes!
Basic principles: The sum of the voltages coming from the manual Address control and the CV input define the currently addressed step of the 3 sub-devices. If the module is controlled by clock and reset the control voltage has to remain unchanged as the CV control has priority over the clock/reset control (e.g. simply turn the CV control fully counterclockwise and do not touch the Address control knob).
Sub-device #1 is the bidirectional 8-fold multiplexer (kind of an electronical 8-fold rotary switch). Bidirectional means that it works into both directions like a mechanical rotary switch: the common socket may work as an output that is connected to one of the 8 inputs that are e.g. connected to modulation or audio sources. But the common socket may even function as input. In this case the signal applied to the common socket is output to the currently addressed single socket. The voltage range of the in/outputs to be switched is the full A-100 voltage range -12V....+12V. All A-100 signals can be switched without any restrictions.
Sub-device #3 is the digital output section. The digital output of the currently addressed turns to "high". All other digital outputs are low. The digital outputs can be used to trigger e.g. envelope generators or to control the reset input in the clocked mode to reduce the number of addressed stages.
Remark: The clock signal that is fed into the Clock In socket has to be GND referenced to the A-100 frame. The reason for this is a recognition circuit at the clock input that is used to decide if the module is clock controlled or voltage controlled. For this recognition the GND pin of the Clock In socket is used. If an external clock signal is used (i.e. not coming from a module mounted into the A-100 frame where the A-152 is mounted) the GND reference is missing and the recognition circuit does not work (with the result that the clock input does not work). But there is a simple workaround: as soon as both systems are connected by means of any other patch cable that way the GND reference is established.
For more detailed information please look at the English user's manual