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Modular Sequencer Project Inside
My plan for this was to make a trigger sequencer that could be used on any properly prepared toy. To do this the sequencer needs to have an isolated parallel connection to the buttons on the toy. The connection should be isolated so it can be used on matrixed/addressed buttons or buttons which have a terminal connect to Power or GND.
I am using a 9V wall adapter to power the sequencer, and a 9 volt battery to power the crossfader. I am not using a voltage regulator and the adapter is putting out 12V. All chips I am using are CMOS so they can handle the voltage. The signal from the 555 to the 4017 (A) needs to be 8.4-12V for the 4017 to advance. The output signal from the 4017 (B) should be 0.5V below VDD or ~11.5V. The trigger signal at the 4016 (C) needs to be 8.4-12V to turn the switch On.
I had a LED on each 4017 output (placed before the DIP switch and diode), and this plus the diode after the switch dropped the voltage below 8.4V resulting in erratic multiple triggers. Disconnecting the LEDs and placing a pull-down resistor (10K to GND) at the 4016 gave me true Low and High signals to trigger the switches.
I discovered other problems such as with trying to use the seq as an 8 beat I could not use two or more DIP switches side by side. This did not allow a Low signal to be passed to retrigger a toy on the same button. I have for this seq decided to simply use every other DIP switch making this a 4 beat seq.
While trying to work out these two particular problems I added 4 relays and a second set of rca outputs. The relays were much easier to trigger and allowed me to compare things in the circuit and troubleshoot more. Ultimately I left both outputs (relay and 4016).
Though I disconnected the LEDs on 4017 outputs I can still have an idea of BPM by the LED on the 555 signal,
Because I now had two sets of outputs I decided I'd try to make a crossfader. I thought if 2 toys were being trigger in sync it would be cool to fade back and forth like a turntable crossfader. It works surprisingly well but there is a problem when it is also power by the same adapter as the seq. The toy connected to the 4016 outputs will shutdown the seq. So for now it is powered by it's own supply.
Some configurations and RCA Y-adapters
Toys can be simply connected using the 4 seq outputs to toy's 4 inputs. Toy's outputs can then go into the crossfader or into a mixer.
On the extreme end one input on one toy could be connected to one output of the seq. The 4 toys' outputs could then go into a 4 channel mixer. The mixer outputs could then go into the crossfader or into another mixer.
A RCA Y-adapter can be used to combine two seq outputs into one toy input. Above is an example of Y-adapter output vs simple hookup.
A RCA Y-adapter can also be used to split a seq output to two toys. Toys could be speaking toy, drum, instrument, or any noise making circuit. Toy outputs could then be put into a mixer or blah blah blah.
This kind of connection creates a connection as if the toys are one circuit. This is also the same as if you took a regular RCA cable and connected the two toy inputs.
Standardize how you connect input jacks on toys. I always put GND sig on outer ring of RCA jack.
If you try the 1 into 2 split use toys of the same voltage. Probably not too good to hookup a 3V toy to a 9V or higher.
Perhaps stick to using non-matrixed/addressed toys for this. Two matrixed/addressed toys might not work when connected together, or they might be really cool.
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