Jbecrtctrl
About the Jbecrtctrl PCB
Jbecrtctrl is an open source PCB design by ngdrascal, published on GitHub under the MIT license. It is a board, with 59 components from 31 distinct parts.
Other key parts include the 1489, 1488, 74LS166, 74LS175 and 74LS00. By type, the board carries 25 capacitors, 19 ICs, 6 connectors, 3 resistors and 1 switch.
From the project
John Bell Engineering CRT Controller board
The CRT interface is controlled by an 8275 programmable CRT controller. The CRT dot and character timing is generated by an 8224 clock generator. A second channel of the 8253 timer provides the appropriate horizontal retrace timing for the CRT monitor. A 2716 EPROM is utilized to provide a user-programmable character generator, and a shift register transforms the data from the character EPROM into a serial bit stream to illuminate dots on the CRT screen. The 2716 character generator makes it possible to display special symbols for word processing or industrial control applications or to…
Main components on the Jbecrtctrl
Jbecrtctrl bill of materials (BOM)
59 components, 31 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1489 | U1 | |
| 1 | 1488 | U2 | |
| 1 | 74LS166 | U3 | |
| 1 | 74LS175 | U4 | |
| 1 | 74LS00 | U5 | |
| 1 | 8251 | U6 | |
| 2 | 2716 | U7, U12 | |
| 1 | 8275 | U8 | |
| 1 | 8253 | DIP-24_W15.24mm | U9 |
| 1 | 74LS139 | U10 | |
| 1 | 8085 | DIP-40_W25.4mm | U11 |
| 1 | 74LS163 | U13 | |
| 2 | 8185 | U14, U18 | |
| 1 | 8282 | U15 | |
| 1 | 8224 | DIP-16_W7.62mm | U16 |
| 1 | 74LS74 | U17 | |
| 1 | 8255A | DIP-40_W15.24mm | U19 |
| 1 | Conn_02x22_Odd_Even | J1 | |
| 1 | Conn_02x20_Odd_Even | J2 | |
| 2 | Conn_01x02 | J3, J4 |
Show 11 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | Conn_01x03 | J5, J6 | |
| 1 | 1N4001 | CR1 | |
| 2 | 10K | RP1, RP2 | |
| 1 | SW_DIP_x08 | SW1 | |
| 1 | 6.144 MHz | XTAL1 | |
| 1 | 11.34 MHz | XTAL2 | |
| 5 | 4.7uF | C1, C2, C3, C4, C25 | |
| 1 | 350pF | C5 | |
| 18 | .01uf | C6, C7, C8, C9, C10, C11, C12, C13 +10 | |
| 1 | 10pF | C23 | |
| 3 | 1K | R1, R2, R3 |
Jbecrtctrl design files
The KiCad project lives in the ngdrascal/jbecrtctrl repository on GitHub; these links point at the commit this page was built from.
Jbecrtctrl: common questions
How many components are on the Jbecrtctrl?
59 components, from 31 distinct parts. The full bill of materials is listed on this page.
Where can I download the Jbecrtctrl design files?
From the ngdrascal/jbecrtctrl repository on GitHub, which has the schematic; the links under Design files point to each one.
Can I use the Jbecrtctrl design in my own project?
Yes, under the terms of its MIT license, which ngdrascal chose for the repository.