How to derive a line level output from a speaker.

2022 02 23

This circuit uses a voltage divider to derive a line level output from a speaker inside low voltage low wattage devices like 5 volt powered electronic toys and 5 volt powered electronic musical instruments.
With a line level output the device can be connected to an audio amplifier or a mixer.
If into circuit bending, adding a line level output to the device first is always a good move.
This circuit uses three-legged switch S1 to direct the +output of the system/device to either the speaker or the line level output.
The parallel 22 ohm and 10 ohm resistors make one 8 ohm resistor to simulate the load of the speaker to the system when the speaker is switched off. These are an option and not a need. If the speaker is large and the wattage of the device is over 2 watt, add these.
The 10K and 1K resistors that make the voltage divider should be 0.25 watt metal film type resistors for best results and audiophile autism.