3
\$\begingroup\$

I'm planning to make a atari punk console for an electronics project, but i have a question, the original circuit published here: http://compiler.kaustic.net/machines/apc.html has a "line outout". Is this a suitable way to drive headphones as well? Should i remove this resistor array and replace it with a log pot in series with the 556's output? Or how should I modify the circuit to drive headphones and have some kind of volume control?

Also, is line output that important?

\$\endgroup\$
2
\$\begingroup\$

In order to drive a speaker (or headphones) you need to supply quite a bit of current, and the 556 can't do that. If the speaker has its own amplifier - for example, USB or portable speakers - you may be able to connect this circuit directly. That said, headphones are usually not amplified, so you will need to amplify the signal yourself with an op-amp. The typical application circuit for a LM386 will probably accomplish what you need. Just connect your line out to Vin. It even has a 10k potentiometer for volume control! Just be sure to use a logarithmic pot for best results.

Typical LM386 Application

\$\endgroup\$
1

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.