BugBrand CTL1 Touch Panel User manual

CTL1 – Touch Panel
Rev1 – Jan2010
Overview
The CTL1 Touch Panel combines a 4-Key Touch Controller with rows of a 4-Stage Preset Sequencer. The Touch
Pads generate individual CV Pressure Outputs, plus a Common Pressure and Common Gate. The active step of the
Preset Sequencer is selected either by using the Touch Pads and Step Input.
Controls
1. Step Input – Any voltage over c.+1.5v will clock the Preset Seq stage selection [dependent on Direction
Switch]. While a gate / clock signal may typically be used, any waveform that rises above 1.5v will work.
2. Row Range Switches (1 – 3) – Individual range selection switches for the three Rows – 10v, 5v, 1v.
(Voltage levels are preset on the rear of the module)
3. Direction Switch – Activates the Preset Seq clocking and selects left or right shifting of the active stage.
4. In ivi ual Pressure CV Outputs (A – D) – Key Pressure voltage outputs for the four individual keys.
Output range is 0v (inactive) to +10v maximum. (Pressure response is preset on the rear of the module)
5. In ivi ual Pressure LEDs (A – D) – Indication of the Pressure voltage outputs.
6. Common Pressure CV Output – Summed output of all four Key Pressure voltages (0-10v range)
7. Touch Pa s (A – D) – In general the keys respond in a monophonic way (ie. Press one key at a time).
When pressing a key the selected stage is 'held' (ie. Clocking is deactivated)
8. Preset Dials – Three rows and four stages to set Row Output voltages. Only one stage is active at any
time, but the three rows are independent.
9. Stage Active LEDs (A – D) – Showing the active Preset stage.
10. In ivi ual Row CV Outputs (1 – 3) – Outputs for the three rows with range governed by the individual
range switches.
11. Gate Output – The gate output goes high (+5v) whenever any touch pad is pressed. When not pressed the
gate output is 0v.

A justments:
1. Key Response – The touch pads are set to a general level of response on shipment, but this may prove
too sensitive or not sensitive enough for individual users. By using a small flat-head screwdriver you can
adjust the sensitivity with the trimmer located at the bottom left of the PCB. Adjust slightly and re-test
the response – settings will generally be around the middle of the trimmer's range. Once adjusted this
should not require further trimming.
2. Range Voltages – The precise 1v/5v/10v range settings can be made with the three multiturn trimmers
near the centre of the PCB. A voltmeter is useful for setting these accurately, but they have been
adjusted before shipment and should be fine already. To adjust, connect the voltmeter to one of the
outputs, select a stage (manual key press) and turn the corresponding Preset dial up to full. Set the row's
Range switch to 1v to start with and adjust the respective trimmer until the output voltage is measured
as an accurate 1v. Switch the Range switch and adjust the other settings as required.
Specifications
Current Draw: +ve 5mA, -ve 15mA (max.)
Module Width: Frac-width (4.5”)

A justment Proce ure
There is one multi-turn trimmer in the circuit, but this should not need to be altered in general use. Please read
the notes carefully performing any adjustments. The trimmer adjusts the triggering bias and incorrect setting
can mean the envelope either does not trigger or stays permanently on.
To test correct setting (without oscilloscope) – set Range to Mid and Mode to Loop, Attack and Decay to around 2
o'clock with no modulation or gate input. In this setting the Indicator LED should pulse On / Off at a relatively
quick rate.
If the LED stays permanently lit then the trimmer should be slowly turned anti-clockwise until pulsing begins.
If the LED stays permanently unlit then the trimmer should be slowly turned clockwise.