AR3 solderpads and hacks
The AR3 triple AR envelope generator has some solderpads that you can use to change some functions on it.
Disable the 1K output resistor
On the bottom side of the PCB there are 4 solder-switches near the jacks.
By soldering a short for any of these solder pads, you can eliminate the 1K output resistor for that jack.
The OP’s used for this module is LM358 and TL074 that has built in short-circuit protection on the outputs.
Therefore, it is possible to do this hack if you need, but it is still better to leave the 1K resistors working as default for extra protection.
- SJ2 – AR1
- SJ1 – AR2
- SJ5 – AR3 pos
- SJ3 – AR3 neg
v1.1 and up
- SJ1 – AR1
- SJ2 – AR2
- SJ3 – AR3 pos
- SJ4 – AR3 neg
Negative output pins – JP3
On the bottom side of the PCB there is also place for a 2×3 pin connector.
Here you will get negative outputs for all 3 envelope generators.
These outputs are NOT protected with any output resistors. You need to add a 1k resistor on the connector from this pinstrip to the jack.
One side of the connector are the 3 negative signals, and the other side are 3 GND pins.
You need to mount and solder the connector from the backside. That can be a bit tricky and you need to solder it a bit higher so that you can manage to solder under the plastic frame of the pinstrip connector.
You can also use the manikk Analog8 module and connect these three output pins to three of the eight analog8 jacks. All the eight outputs of the Analog8 are protected and then you don’t need to add the 1k resistors yourself.
The first few modules up to serial number 105 had a 100k linear pot for the release. All newer modules now have a 1M linear pot for the release, which gives a much longer and nicer release. It is possible to replace this pot, but it can be difficult to unsolder the old pot without damaging the pcb traces. Warranty is voided if you make this modification.