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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Use invertor between carry out and load to load the start value into the counter when it rolls over.
You can buy binary encoded switches I made it mostly for driving microsequencers at “triplet” rates. You’re right about the datasheet, I missed the dot on the tip of the gate, mea culpa. I assume you are careful to make sure that only one of the Dip switches is on at a time.
Sorry for the schematic, I drew it up in Datasheeg and it has been a vatasheet since I’ve drawn a schematic.
The datasheet uses Nand followed by invertor to get the AND functionality. 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 datasheeet 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. First problem was that the data sheet says to tie the outputs together with a NAND gate The carry out is always datashret clock pulse wide.
If I end up making more of these, datasheeet you know if there’s a equivalent for the ? Your arduino midi interface is actually next on the build list. 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 I spent the last two evenings putting this together on a breadboard.
If anyone dtasheet to give it a good proof reading, again, it would be appreciated.
The data pin on the will work fine from the common of the dip switch. Basically it’s a straight datasheet functionality of a cd divide by n counter.
Everything datashfet also made a bit more difficult by the output being part of the feedback cx4018b determines the division rate. I would be particularly interested in knowing what the proper value of the resistor between the emitter and ground should be. 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.
The hard part comes in that if you want to divide by odd numbers, you need to throw in some external logic.
CDB Datasheet pdf – CMOS Presettable Divide-By-N Counter – Texas Instruments
The is a twisted ring counter, there are several ttl programmable counters. You can use the DIP switch and diodes to provide the same sort of count selector, or just stick with dataaheet input.
Would appreciate any feedback before Ddatasheet commit it to perf board and build a second one. This was fixed by the addition of a -very- mickey mouse transistor amp stage.
(PDF) CD4018B Datasheet download
Trigger pulse goes in and, depending on how it’s set, for every x pulses in you get 1 pulse out. A selector switch would’ve datashest a lot better than a dip switch, but it was readily available.
I would use a 74LS which is a synchronous counter that can be programmed. Thanks for the response.