A/B Selector
Rev.1.Jul.22.2006
Build an a/b switch box with indicator LEDs. One common input routed to two selectable outputs or two
selectable inputs routed to one common output. LEDs show which path is connected. If no LEDs are
required use a DPDT switch and leave out the DC jack/battery part of the circuit, as it is only needed to
power the LEDs.
+9v
INPUT JACK
SHIELD
LEDA
INPUT JACK
RING
LEDB
OUTPUT B
TIP
2k2
3PDT
INPUT JACK
TIP
OUTPUT B
SHIELD
Layout and presentation by Francisco Peña 2001-2006®.
All rights reserved. Authorization for personal use only,
any commercial use is forbidden.
Permission for posting/serving limited to
http://www.tonepad.com
Permission refused for posting from other sites.
OUTPUT A
TIP
OUTPUT A
SHIELD
Parts List
1 - 2.2k resistor
2 - LEDs
2 - LED mounts
1 - Stereo jack
2 - Mono jacks
1 - 3PDT switch
1 - DC jack
1 - Battery snap
1 - Enclosure
BATTERY SNAP
Schematic
“A” path selected
AC
ADAPTOR +
9v
LEDB
INPUT
OUTPUT A
LEDA
OUTPUT B
2k2
0
