The LM3915 sound level meter is vocoderised and becomes a peak programme meter. I explain split power supplies, alternating current audio signals, and why op amp circuits often require positive and negative power supplies. Then I start singing. All very weird.
ETI Vocoder constructional project reproduced with permission from Wimborne Publishing Ltd. http://www.epemag.com
ETI Vocoder constructional project reproduced with permission from Wimborne Publishing Ltd. http://www.epemag.com
Should have done the halo theme music with the echo, would have sounded great! 😉
Hi Julian, great video and explanation in pos/neg power supplies. Did you do a video on another karaoke board and if so which video was it. Regards, Dave
Some pro audio mixers can switch the meters between PPM and VU modes. VU mode shows the RMS level, so it's a bit slower/smoother and will only show 3 dB below the actual peaks, whereas PPM mode is faster and shows actual peak levels.
funny vid lol
You can easily omit a spilt voltage supply if you set up a virtual ground for them OpAmps. For basic usage by just using a voltage divider. and use it for your OpAmps as a ground path. Now you need to block the DC with capacitors, but that´s about it.
Hopefully your ETI stuff is going to work. I had lots of trouble getting their stuff to work right when i built it….They kinda work but not as supposed to do, and add some flaws herre and there…
Anyway good video, as always…:)
It doesn't detect distortion, it detects clipping. The speakers sound output is distorted.
Julian, I'm just starting out electronics and I'm using a crappy wall-plug in variable power supply with no selection between 4.5 and 6v. What kit are you using here for the power supply, or what would you recommend for a very cheap power supply that provides 5v?
That cap is absolutely fab !
What is the chip in the preamp? How's the echo effect implemented?
I dunno, I think the sounding better in the shower thing, like the negative voltage, is a relative thing 😛
I just can't believe the amount of electronics junk I have now ordered from China. Watching these channels should come with a health warning.
Bipolar rails may not always be required if you use capacitors (as isolating and level shifting devices). Input BJ transistors can then be biased at some positive level on a single-rail amplifier's voltage.