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Doepfer A-164.1
Manual Gate

This page was last updated 14/08/2008

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A-164.1 Manual Gate
A-164.1 The A-164.1 has 3 push buttons that are used to generate three separate manual gate signals (i.e. ~ +12V voltage output while button is operated, 0V when released). The gate number (1, 2, 3) is milled into the caps and white inked.
Gate 1 is a bit different: provided that no plug is connected to the input socket it behaves like the other two manual gates (the socket is normalled to +12V via a protection resistor). If a control signal (e.g. rectangle output of an LFO) is fed into the input socket, the gate button 1 is working as a momentary on/off switch that is used to turn the signal on/off that appears at the two output sockets (kind of mute function). Each Gate output has two sockets available (miniature multiple). Internal jumpers can be used to connect Gate 1 or Gate 3 to the gate line of the internal A-100 bus. That way the module can be used to control one or more envelope generators (e.g. ADSR A-140) that are connected to the same bus board as the A-164. The gate outputs are "smoothed" to avoid contact bouncing. If Gate unit 1 is used to switch audio signals then an internal capacitor should be removed as it will function as a low pass filter for audio signals.\


Note: There are two angled pin headers (labelled JP2 and JP3) on the pc board. These are used to connect Gate 1 (JP3) or Gate 3 (JP2) to the Gate line of the A-100 bus. Only one of the two jumpers is allowed !

Also note that the module comes with a jumper installed to JP2 (i,e. Gate 3 is connected to the A-100 bus). The jumper has to be removed if an A-190 is already connected to the Gate line of the same bus board! If the A-164.1 should be used as a Gate source for the A-100 bus, the connection of any other Gate source (like the A-190) has to be removed. Otherwise a short circuit is made between the outputs of the Gate transmitters, and things could get nasty!
Width
6 HP
Depth
20 mm
Current
10 mA
Owners manual coming soon


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