Zenith zt1
About the Zenith zt1 PCB
Zenith zt1 is an open source PCB design by misterblack1, published on GitHub. It is a 2-layer board measuring 221.5 × 149.5 mm, with 140 components from 70 distinct parts.
Other key parts include the 74LS74, 74LS373, 74LS02, uA_{7}805 and 74LS32. By type, the board carries 47 capacitors, 43 ICs, 19 resistors, 15 diodes, 5 switches and 4 inductors.
From the project
Information gathered on the Zenith ZT-1 / ZT-10 / ZT-11 and ZTX/ZT-x-A variants
The Zenith ZT-1 was a device that came out around 1981 that looked like a keyboard. It was designed to be used by someone who wanted to connect to online services via the internal 300 baud modem without the need of a computer. You would connect a monochrome composite video monitor and interface with it via an internal menu structure held in ROM. The system uses an Intel 8031 MCU (this is a variant with 128 bytes of internal RAM but no internal ROM) as the main CPU, it has 8K of ROM on two 2732 ICs (dumped), 1K of SRAM (via two 2114 chips), a single 2Kx8 6116 SRAM likely used as video RAM and…
Main components on the Zenith zt1
Zenith zt1 bill of materials (BOM)
140 components, 70 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74LS74 | DIP-14_W7.62mm | U101, U128 |
| 2 | 74LS373 | DIP-20_W7.62mm | U102, U118 |
| 1 | 74LS02 | DIP-14_W7.62mm | U103 |
| 2 | uA_{7}805 | TO-220-3_Vertical | U104, U143 |
| 2 | 74LS32 | DIP-14_W7.62mm | U106, U115 |
| 2 | 74LS08 | DIP-14_W7.62mm | U107, U131 |
| 1 | 74LS00 | DIP-14_W7.62mm | U108 |
| 4 | 74LS368 | DIP-16_W7.62mm | U109, U112, U122, U123 |
| 1 | D444C | DIP-18_W7.62mm | U111 |
| 2 | 2732 | DIP-24_W15.24mm | U113, U114 |
| 1 | 74LS138 | DIP-16_W7.62mm | U116 |
| 1 | P8031AH | DIP-40_W15.24mm | U117 |
| 1 | 74LS245 | DIP-20_W7.62mm | U119 |
| 1 | 74156 | DIP-16_W7.62mm | U121 |
| 2 | D2114LC | DIP-18_W7.62mm | U124, U125 |
| 1 | HM6116P | DIP-24_W15.24mm | U126 |
| 1 | 7432 | DIP-14_W7.62mm | U127 |
| 1 | 74LS93 | DIP-14_W7.62mm | U129 |
| 1 | 74LS10 | DIP-14_W7.62mm | U132 |
| 1 | 74LS86 | DIP-14_W7.62mm | U133 |
Show 50 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 8275 | DIP-40_W15.24mm_Socket | U134 |
| 1 | TMS2516 | DIP-24_W15.24mm | U135 |
| 1 | 74LS04 | DIP-14_W7.62mm | U136 |
| 1 | 74LS175 | DIP-16_W7.62mm | U137 |
| 1 | 74ALS574 | DIP-20_W7.62mm | U138 |
| 1 | 7409 | DIP-14_W7.62mm | U139 |
| 1 | 74LS166 | DIP-16_W7.62mm | U141 |
| 1 | 74LS161 | DIP-16_W7.62mm | U142 |
| 1 | 78L05 | TO-220-3_Vertical | U144 |
| 2 | 74LS153 | DIP-16_W7.62mm | U145, U146 |
| 2 | 74LS193 | DIP-16_W7.62mm | U147, U148 |
| 2 | 2N3904 | TO-92L_Inline_Wide | Q101, Q102 |
| 1 | Crystal | Crystal_HC18-U_Vertical | X101 |
| 1 | DE9_Pins | DSUB-9_Pins_Horizontal_P2.77x2.54mm_EdgePinOffset9.40mm | P102 |
| 1 | Conn_02x20_Odd_Even | PinHeader_2x20_P2.54mm_Horizontal | P103 |
| 1 | 2.4V NiCd | Battery | B101 |
| 2 | Conn_01x12 | PinHeader_1x12_P2.54mm_Vertical | S101, S102 |
| 1 | Conn_01x16 | PinHeader_1x16_P2.54mm_Vertical | S103 |
| 1 | Composite | RCA | S104 |
| 1 | PB_WPTKT | SW_DIP_SPSTx01_Slide_6.7x4.1mm_W7.62mm_P2.54mm_LowProfile | SW101 |
| 1 | BEEPER | Buzzer_12x9.5RM7.6 | TD101 |
| 4 | 1N2071 | D_DO-34_SOD68_P10.16mm_Horizontal | D101, D102, D103, D104 |
| 6 | 1N4448 | D_350mil | D105, D106, D107, D108, D111, D112 |
| 5 | 1N4149 | D_350mil | D109, D121, D122, D123, D124 |
| 4 | 35uH | L_Axial_L7.0mm_D3.3mm_P5.08mm_Vertical_Fastron_MICC | L101, L102, L103, L104 |
| 2 | 2.2uF 15V | CP_520mil | C101, C102 |
| 2 | 2.2uF 20V | CP_Radial_D8.0mm_P5.00mm | C103, C104 |
| 1 | 10000uF | CP_Radial_D10.0mm_P5.00mm | C105 |
| 1 | 47uF | CP_Radial_D5.0mm_P2.50mm | C106 |
| 1 | 1uF | CP_Radial_D5.0mm_P2.50mm | C107 |
| 1 | 150pF | C_Disc_D9.0mm_W2.5mm_P7.50mm | C108 |
| 1 | 10nF | C_Disc_D9.0mm_W2.5mm_P7.50mm | C109 |
| 1 | 47pF | C_Disc_D9.0mm_W2.5mm_P7.50mm | C110 |
| 33 | 10nF | C_350mil | C111, C112, C113, C114, C115, C116, C117, C118 +25 |
| 1 | 2.2uF | CP_520mil | C120 |
| 1 | 2.2uF | CP_350mil | C154 |
| 1 | 10nF * | C_350mil | C156 |
| 1 | C | C_Disc_P7.62 | C1001 |
| 1 | 100 | R_450mil | R101 |
| 4 | 1K | R_450mil | R103, R128, R129, R153 |
| 3 | 10K | R_450mil | R104, R115, R145 |
| 3 | 4.7K | R_Array_SIP6 | R109, R111, RN112 |
| 1 | 680 | R_450mil | R113 |
| 1 | 120 | R_450mil | R122 |
| 1 | 270 | R_450mil | R123 |
| 1 | 200 | R_450mil | R124 |
| 1 | 51 | R_450mil | R126 |
| 1 | 68 | R_450mil | R127 |
| 1 | 12K | R_450mil | R151 |
| 1 | 470 | R_450mil | R152 |
Zenith zt1 design files
The KiCad project lives in the misterblack1/zenith_zt1 repository on GitHub; these links point at the commit this page was built from.
- LayoutZT1 Schematics/ZX1.kicad_pcb
- SchematicZT1 Schematics/ZX1.kicad_sch
Zenith zt1: common questions
How big is the Zenith zt1 PCB?
The Zenith zt1 measures 221.5 × 149.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Zenith zt1?
140 components, from 70 distinct parts. The full bill of materials is listed on this page.
Where can I download the Zenith zt1 design files?
From the misterblack1/zenith_zt1 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Zenith zt1 design in my own project?
The repository has no license, so all rights stay with misterblack1. Use it as a reference, and ask the author before reusing the design.