Fun with the 4093 NAND gate

JingleJoe

Unless anyone else posts in this forum any time soon I am going to end up dominating all the newest posts Laughing

Here is my first foray into Lunetta/CMOS/Logicotronic sound making devices!

http://www.youtube.com/watch?v=1MU16cC06aM

I name it bleeping ear masher.

http://www.youtube.com/watch?v=RsGaSlGtGXU

Schematics are included below.
I used just one 4093 chip (four NAND gates with built in schmitt trigers on the inputs)
The three 470k resistors in the diagram were variable, and one might have been a 1 meg pot, I didn't check because I was sure it was either 1 meg or 470k. Each was in series with a 10k resistor (or there abouts, I think one was 15k).
The two oscillators on the left are low and high frequency, thier outputs are combined by the third nand gate which then gates the final oscillator.

All component values are variable however very low values for the resistors results in high distortion of the output and subsequently significantly less fun Sad

keep them above 10k to maintain spiffing sound madness! Very Happy

I also hacked together an amplifier with some transistor I had laying around, it gets really hot so I included a heatsink in the form of a crocodile clip on the tranny Wink

all parts but the chip were scavenged.

my first lunetta.png

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Circuit diagram

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blue hell

JingleJoe · Posted: Tue Nov 15, 2011 9:29 am Post subject:

Ahoy Blue Hell, thankyou Smile

A question just occured to me, how would one combine the outputs of two gates? via diodes?

Kabzoer · Joined: Feb 07, 2011 Posts: 82 Location: Belgium

Wew, coll oscilloscope thingy, what's that? I'm going to buy an oscilloscope sooner or later, I'm going trough the different options...

Kabzoer · Joined: Feb 07, 2011 Posts: 82 Location: Belgium

Sorry, didn't see your question, yes with two diodes, that forms an OR gate.
you can see various ways of simple gates w/ resistors or diodes on the image, the double inverters are to buffer the gates, but when your sending it into another CMOS chip, you will not need them

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JingleJoe · Posted: Tue Nov 15, 2011 10:20 am Post subject:

Brilliant, thankyou! That is exactly what I needed Very Happy

I got that o'scope about 5 or 6 years ago from ebay for £7 (I think)
I didn't want to pay through the nose for some expensive "top of the range" one when I wasn't even going to use it for anything that had to be super accurate.
So I bought that one- simple interface, switched voltage scale control, no messing around with 2308576 dials, just switch it on, plug it in and you've got green wavey lines Wink

I have three others which use valve based circuitry, they act as heaters in the winter Razz

P.S. just thought I'd add: all my oscilloscopes came from places that were closing down or retired engineers.