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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Your datasneet midi interface is actually next on the build list. Sorry for the schematic, I drew it up in MSPaint and it has been a while since I’ve drawn a schematic.
CMOS littlebit clock divider – Invention Buzz – littleBits discussions
I assume you are careful to make sure that only one of the Dip switches is on at a time. The datasheet uses Nand followed by invertor to get the AND functionality. Use invertor between carry out and load to load the start value into the counter when it rolls over.
The carry out is always 1 clock pulse wide. This was fixed by the addition of a -very- mickey mouse transistor amp stage. If I end up making more of these, do you know if there’s a equivalent for the ?
CDB Datasheet pdf – CMOS Presettable Divide-By-N Counter – Texas Instruments
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. 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 If anyone cares to give it a good proof reading, again, it would be appreciated.
You can use the DIP switch and diodes to provide the same sort of count selector, or just stick with binary input. Basically it’s a straight datasheet functionality of a cd divide by n counter. The is a twisted ring counter, there are several ttl programmable counters. Trigger pulse goes in and, depending on how it’s set, for every x pulses in you get 1 pulse out.
CD4018B Datasheet PDF
The data pin on the will work fine from the common of the dip switch. I made it mostly for driving microsequencers at “triplet” rates. The hard part comes in that if you want to divide by odd numbers, you need to throw in some external logic.
Everything is also made a bit more difficult by the output being part of the feedback that determines the division rate. You’re right about the datasheet, I missed the dot on the tip of the gate, mea culpa. Would appreciate any feedback before I commit it to perf board and build a second one.
First cd4108b was that the data sheet says to tie the outputs together with a NAND gate I would use a 74LS which is a synchronous counter that can be programmed. Regarding the transistor though, whether it should be able to or not, the is capable of driving both an output led and triggering a 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 would be particularly interested in knowing what the proper value of the resistor between the emitter and ground should be. You can buy binary encoded switches A selector switch would’ve been a lot better than a dip switch, but it was readily available.
Thanks for the response. I spent the last two evenings putting this together on a breadboard. A 74LS08 has more output drive with a slightly different pin out. I could not, however, run the output of a to the data pin with any success unless I first amplified it.