TRS-80 Model X Composite Video

8 months ago 2519
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

Composite video board for Tandy Radio Shack TRS-80 Model II, III, 4 and 4P computers.

 

Note: make sure to use MM74C04N or CD4069 hex inverters. 74LS04, 74HC04 or other variants will probably not work!

 

Find the manuals here:

v1.02.03: https://blue-print.be/product-manuals/Manual-trs80-videomixer.pdf

v1.04.09: https://blue-print.be/product-manuals/TRS-80_M3-4-4P_Video_Mixer_Manual_v1.04.09.pdf

 

I'm releasing this under the LGPL license. If you make any changes to the schematics or PCB designs you are required to provide these easily accessible for anyone to enjoy.

 

Have fun.

https://blue-print.be/

Documents

CVB v1.02

PCB-V1.02.03 - RTP

PCB-V1.04.09 - RTP

BOM

ID Name Designator Footprint Quantity
1 Composite Video OUT JP3A HDR-TH_2P-P2.54-V-M 1
2 5mm Green LED LED1 5MM_LED_2.54 1
3 74LS04 LEFT U2 DIP-14_2.54_7.62 1
4 74LS04 RIGHT U3 DIP-14_2.54_7.62 1
5 7805 U6 TO-220-3_L10.0-W4.5-P2.54-L 1
6 5V Power IN JP2 HDR-4X1/2.54 1
7 TRS-80 Video JP1 1X06-BIG 1
8 SN75453B U4 DIP-8 SOCKET 1
9 10µF C1,C7,C8 CAP-TH_BD5.0-P2.00-D0.8-FD 3
10 74LS00 U1 DIP-14_2.54_7.62 1
11 POWER JACK 5V Center Positive U5 JACK DC POWER-1 1
12 Edge 12V Jumper J1A 1X2 PIN HEADER 2.54MM 1
13 Edge 5V Jumper J1B 1X2 PIN HEADER 2.54MM 1
14 203Z C2 RAD-0.2 1
15 473Z C3 RAD-0.2 1
16 331 C4 RAD-0.2 1
17 471 C5 RAD-0.2 1
18 .01M C6 RAD-0.2 1
19 0.1µF C9,C10 RAD-0.2 2
20 2N3904 T1 TO-92 1
21 2N3906 T2 TO-92 1
22 10-Way PCB Edge Connector 0.156" pitch U7 10-WAY_0156IN_PITCH_PCB_EDGE_CONN 1
23 82 Ohms R3 AXIAL-0.3 1
24 270 Ohms R4 AXIAL-0.3 1
25 150 Ohms R5 AXIAL-0.3 1
26 330 Ohms R6 AXIAL-0.3 1
27 47 Ohms R7 AXIAL-0.3 1
28 12 Kohm R8 AXIAL-0.3 1
29 11 Kohm R9 AXIAL-0.3 1
30 1,8 Kohm R10 AXIAL-0.3 1
31 220 Ohms R11 AXIAL-0.3 1
32 100kΩ R1,R2 PT10LV10 100K 2
33 Composite Video OUT RCA JP3B CUI_RCJ-012 1

Attachments

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