Circuit Bending Tutorial #1 - Alternative to LTC1799

[@SkullDraizer]

Very cool.

[@SMMPUK]

Thanks

[@kgbstudio]

what a cool video, thanks

[@SMMPUK]

thanks :) hope it helps!

[@bpn12123]

Noob question: Can I use a 555 timer to controll the clock? And if so why I only see people using the LTC1799? In the same topic, can I use any oscilator type circuit to control the internal clock of a toy?

[@derWarst]

Thing about the LTC1799 is that it's very stable in a frequency range of 3-33Mhz. A 555 doesn't go as high and also isn't as stable.

[@MazHoot]

Hello, sorry if it’s out of subject but i already have ltc 1799 but it’s my first time with it. I saw you used a pss-30 keyboard on your video. Can you help me to find where is the voltage pin on the board to connect to the ltc 1799 ? It must be between 2.7v and 5.5v. Thank’s :-)

[@SMMPUK]

Hi, sorry for the late reply. I can't remember where is the voltage pin, although I am pretty sure that I hooked the LTC1799 up to the main chip's positive voltage, the YM2410 one, where you also connect the LTC1799, since it's powered by 4.8V or 5.2V which is fine. There are some schematics here, if it may help: kzbin.info/www/bejne/eYqnln98gc5pfKc

[@MazHoot]

@@SMMPUK I tried solder it on the main chip's pin, where voltage was 4.61 according to multimeter. But it don't work I have no sound now... could you help me to determine what is wrong ? this is a video of my pcb : kzbin.info/www/bejne/rHqve3t_i76ZntU

[@MazHoot]

@@SMMPUK Do you have a schematic of the pss-30 ? I tried again with a friend why knows good electronic but he tried to find a schematic without success. Now the ltc1799 alimentation is connected on the + of the batteries and the ground to the spring of the batteries. When I boot up pss-30, sometimes keyboard works for 3 seconds and then it crashes, and a noize come. This noise can be pitched out or down by the potentiometer connected on ltc1799 but no sound on the keyboard :(

[@SMMPUK]

Hi, I replied to you in a previous comment and linked you to a video where there are some of my schematics. If you get no sound it could be that the ltc is working at a frequency too high or too low and so you need to short b and c , or maybe try with another ltc chip if you have it as they are delicate and sometimes the stop working. In the video I linked you to there should be how to connect the clock

[@u-n-i-versus]

Nice one! I learned about this year's ago by user Sam_Zen on the electro-music forum. Unfortunately Sam_Zen past away in 2010. But E-M has a great forum lots of circuit bending knowledge on there. Thanks for schematic and explaining, I had forgotten the chip name. I have some laying around but have not tried them as clock oscillators. Can we go ultra low pitch with these?

[@SMMPUK]

If you want to go ultra low, one option is to use a frequency divider like the cd4040 and maybe a rotary switch,so you can still have a wide range. Probably the limited narrow range is due to the fact that the voltage supply is only 5V. With other VCO like the cd4046 you can have a wider range you guess

[@u-n-i-versus]

@@SMMPUK Cool, thank you! I will try the different options. I guess 4046 is the way to go, just to keep the parts count low. Maybe the xor gate on this could be used momentarily to crash the main chip? Just guessing here..

[@productoramutanteorg]

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