Delptronics ThunderBell - Manual (Page 9)

ThunderBell Mini Kit Instructions
Page 9 of 10
Output Jack (±)
The output jack is a ¼ inch stereo jack, also called a TRS (tip, ring, sleeve) jack. Refer to the PCB outline above and
the diagrams below. Make sure that the right pins on the jack are connected to the correct holes in the PCB. The
round pad is the ground and connects to the sleeve lug of the jack. The square pad is the signal and connects to the
tip lug.
If you are using an open frame jack, look carefully at which lug is connected to which contact, because not all open
frame jacks are the same. If you are using a closed frame jack that is switched, then there are six terminals on the
jack, so make sure that it is oriented as shown. If you connect the wires to the switched terminals, then nothing will
happen when you plug in the jack.
9V Battery Snap (±)
A 9V battery snap with wires is included with your kit. Solder the red (positive) wire from the snap to the square hole
on the PCB power connector. Solder the black (negative/ground) wire to the ring (middle) terminal of the output jack.
When connected as described, the battery ground is only connected to the circuit when a plug is inserted into the
output jack. So, the device is on when a jack is inserted, and it is off when no jack is inserted. The diagram below
illustrates how this works.