 |
The Teletext Museum. |
        |
|
    |
|
|
|
|
|||||||||
|
|||||||||||
D.I.Y. TELETEXT DECODER
BOARD 3
Fig. 4. - The renumbered board three circuit.
|
Board Three - PARTS LIST | |||
| RESISTORS all 1/4 W 5% | CAPACITORS | ||
| R301, 344 | 5k6 | C301 | 2n2 ceramic |
| R302, 303 | 680R | C302, 304, 308, 314, 339 | 82p ceramic |
| R304, 307, 320-324, 334 | 3k3 | C303 | 56p ceramic |
| R305 | 1k8 | C305, 341, 342 | 27p ceramic |
| R306, 314, 316, 343 | 10k | C307, 315, 316,, 318-329 | 100n polyester |
| R308 | 820R | C309, 310, 334 | 33u 16V electrolytic |
| R309, 315, 336, 341 | 1k0 | C311 | 10u 25V electrolytic |
| R310 | 220R | C331 | 18p ceramic |
| R311, 325 | 68R | C332, 337, 338, 340, 343 | 6u8 25V tantalum |
| R312, 318 | 4k7 | C335, 336 | 1p8 ceramic |
| R313, 317 | 56R | Note C319-329 are decoupling components and are not shown on the circuit diagram. | |
| R319 | 470R | ||
| R326, 331, 332 | 10R | SEMICONDUCTORS | |
| R327, 330 | 180R | IC301 | 74S04 |
| R328, 335, 340 | 100R | IC302 | 74S74 |
| R329 | 150R | IC303 | 74LS138 |
| R333 | 18k | IC304 | 7400 |
| R337 | 6k8 | IC305, 306, 308 | 7408 |
| R338, 339 | 2k2 | IC307 | 7486 |
| R342 | 47k | IC309 | 7474 |
| Q301, 304 | BC558 | ||
| POTENTIOMETER | Q302, 303, 305, 307 | BC548 | |
| RV301 | 470R min. preset horizontal | Q306 | BSX20 |
| D301-311 | 1N4148 | ||
| ZD301 | BZY88 / BZX70C5V6 | ||
| VARIABLE CAPACITOR | |||
| CV301 | 22p | MISCELLANEOUS | |
| X301 | 17.73447 MHz | ||
| MOD301 | UM1231 Astec | ||
| PCB | |||
Back >
|
|||
|
The Teletext Museum
is a collaboration with |
|
|
|
|
|
|||
|
