0

I'm building a BMX start gate controller. It requires a voice sample to be played ("Riders ready, watch the gate!") before playing a series of tones at very specific frequencies and intervals. After the tones are complete, a relay is triggered which drops the start gate.

I'm intending to use one of the header pins with the tone() function to output the tones, and an Adafruit AudioFX board to play the voice sample.

How do I connect both of these to an Adafruit mono amplifier (https://www.adafruit.com/product/2130) ?

Note that only one or the other will be playing at one time.

Can I use a "passive mixer" (which I think is putting a 10kΩ resistor on each input source for the amplifier?)

asked Nov 15, 2016 at 23:45

1 Answer 1

1

Yes, a passive mixer would do fine. I would recommend capacitors to remove any DC component too, before you do the mixing. 22uF should do fine.

I will draw a circuit in the morning.

answered Nov 16, 2016 at 1:31

Your Answer

Draft saved
Draft discarded

Sign up or log in

Sign up using Google
Sign up using Email and Password

Post as a guest

Required, but never shown

Post as a guest

Required, but never shown

By clicking "Post Your Answer", you agree to our terms of service and acknowledge you have read our privacy policy.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.