Modified Green Ringer build

[thomasha]

Hi, this time tried a modified green ringer with another extra transistor and a controlled octave effect.
Had some problem with the etch, the paper wasn't right. I still need to calibrate the sensitivity of the sensor...

cheers

[stringsthings]

Very nice build .  I like that controlled octave with the LDR.  I also like the etch.
It has a good vibe to it.

[matmosphere]

That's a great design for the graphics. The whole thing looks great. You kids and your crazy tiny enclosures.

[Addy Bart]

Cool. How is the LDR connected?

[thomasha]

the outside LDR is connected between ground and a transistor's base, like this:



There is another internal LDR coupled with the led shown on that schematic.
The internal ldr is in series with one of the green ringer's diodes. When the internal led is off, the resistance is very high and only one diode rectifies the signal. When the led goes on the resistance drops and the octave effect kicks in.

[Addy Bart]

Thanks for sharing how you did it. I've got some left over LDRs so this will be fun to try on different circuits. Cheers.