I then had the boards created at OSHPark and then soldered all components to the board. Since routing the second layer of NOR gates wasn't much of a layout issue, they were just placed in a column in the remaining space to the right. ![]() The inputs of the NOR gates tap into the required inputs through vias to the back side. The first layer of NOR gates are right below the input buffers and run horizontally along the top copper layer. ![]() I decided to put the input buffers along the top edge of the board with the output signals running vertically along the back copper layer. From there is was just a grind to try to fit all the transistors in as little space as possible. The only difference between gates is the number of inputs.Īfter the schematic was finished, the design was imported into KiCad's Pcbnew. To reduce clutter on the main sheet, each segments logic was given its own sheet.Įach segment sheet then just contains the wiring and NOR gates.Īll the NOR gates are the same. Adding connectors and expanding logic gates into their corresponding NMOS logic circuits. The same logic view was then recreated in KiCad. ![]() You can click the link below to load the live demo of the above image. If I get some time I will try to come back to this and redo the work for a series of images.Īfter simplifying the logic, the circuit was prototyped in Falstad's CircuitJS. I unfortunately can't find the papers where I did this simplification on so I can't include an image of the work. Karnaugh maps were then used to simplify output logic. With what I wanted the output to be in mind, I mapped the corresponding input and output values on paper. There are a few designs out there such as the 74LS47 to convert binary BCD to decimal 0-9 but I personally wanted the full range of 0 to 15 to display. The transistors on the display board are just drivers for the LEDsĪt the start of this project I decided I wanted to decode full 4-bit binary 0 to 15 into hexadecimal 0 to F. The output of the decoder is feed to a homemade seven segment display on the perfboard on the right. The reference algorithm is at the Bitcoin's Base58Check page.The above demo shows the decoder hooked up to a counter circuit on the left breadboard that generates a up counting 4-bit binary signal. Write a program that takes a checksum (resultant hash digest) integer binary representation as argument, and converts (encode it) into base58 with the standard Bitcoin alphabet - which uses an alphabet of the characters 0. The most popular alphabet of base58 is the variant used in bitcoin address (see Bitcoin/address validation), so it is the "default base58 alphabet". ![]() For checksums resulting in hash digests bigger than ~100 bits, the base16 is too long: base58 is shorter and (when using good alphabet) preserves secure human readability. The popular encoding of small and medium-sized checksums is base16, that is more compact than usual base10 and is human readable. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page. Legacy Address to BCH Cash Address Converterīase58Check to Hexadecimal Decoder Onlineīase58Check encodingis a draft programming task.BCH Cash Address to Legacy Address Converter.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |