DESCRIPTION. The HCFB is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. Data sheet acquired from Harris Semiconductor. SCHSC − Revised October The CDB types are supplied in lead hermetic dual-in-line. CDB datasheet, CDB pdf, CDB data sheet, datasheet, data sheet, pdf, Texas Instruments, CMOS Presettable Divide-By-N Counter.
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A selector switch would’ve been a lot better than a dip switch, but it was readily available. Trigger pulse goes in and, depending on how it’s set, for every x pulses in you get 1 pulse out. Sorry for the schematic, I drew it up in MSPaint and it has been a while since I’ve drawn a schematic.
I would be particularly interested in knowing what the proper value of the resistor between the emitter and ground should be.
If anyone cares to give it a good proof reading, again, it would be appreciated. Regarding the transistor though, whether it should be able to or not, the is capable of driving both an output led and triggering datawheet littlebits microsquencer straight from the data pin, as long as it’s doing an even division.
You could add isolating diodes so that you do not have that worry. I could not, however, run the output of a to the data pin with any success unless I first amplified it.
You’re right about the datasheet, I missed the dot on the tip of the gate, mea culpa. The carry out is always 1 clock pulse wide. The datasheet uses Nand followed by invertor to get the AND functionality. You can use the DIP switch and diodes to provide the same dahasheet of count selector, or just stick with binary input. Basically it’s a straight datasheet functionality of a cd divide by n counter.
Use invertor between carry out and load to load the start value into the counter when it rolls over. I would use a 74LS which is a synchronous counter that can be programmed.
You can buy binary encoded switches Second problem was that, probably because of the low voltage of the littlebits power supply, the AND gate output wasn’t pushing enough current to drive the data in on the The is a twisted ring counter, there are several ttl programmable counters. If I end up making more of these, do you know if there’s a equivalent for the ? A 74LS08 has more output drive with a slightly different pin out.
If you want to be more flexible, a simple atmega P chip can be used and programmed to provide any pattern you want to output. Would appreciate any cd4018v before I commit it to perf board and build a second one.
I assume you are careful to make sure that only one of the Dip switches is dwtasheet at a time. First problem was that the data sheet says to tie the outputs together with a Ccd4018b gate This was fixed by the addition of a -very- mickey mouse transistor amp stage. The hard part comes in that if you want to divide by odd numbers, you need to throw in some external logic.
The data pin on the will work fine from the common of the dip switch.
CDB Datasheet(PDF) – TI store
Thanks for the response. Your arduino midi interface is actually next on the build list. Everything is also made a bit more difficult by datasheeet output being part of the feedback that determines the division rate.
I spent the last two evenings putting this together on a breadboard. I made it mostly for driving microsequencers at “triplet” rates.