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apple2_thunderclock
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# ThunderClock Plus
# == Parts List ==
* 1x 1990C
* 1x 2708 (EPROM)
* 1x 74LS08
* 1x 74LS27
* 1x 74LS74
* 1x 74LS109
* 1x 74LS132
* 1x 74LS126
* 1x 74LS174
* 1x CD4050 (Motorola MC14050B / CP QQ8014)
* 1x D4050
* B1 HOLDER BATTERY 1CELL N ALUMINUM DigiKey: [36-154-ND](http://www.digikey.com/product-detail/en/keystone-electronics/154/36-154-ND/61790)
* B2 HOLDER BATTERY 1CELL N ALUMINUM DigiKey: [36-154-ND](http://www.digikey.com/product-detail/en/keystone-electronics/154/36-154-ND/61790)
* C1 104Z (East)
* C2 104Z (East)
* C3 104Z (North)
* C4 104Z (North)
* C5 104Z (East)
* C6 104Z (North)
* C7 NPO 20J
* C8 variable
* CX ???
* D1 ??? M5?2? (Diode)
* D2 ??? N40-0 (Diode)
* R 1 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
* R 2 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
* R 3 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
* R 4 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
* R 5 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
* R 6 Orange Orange Red--- Gold = 33\*100 Ohm +/- 5%
* R 7 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
* R 8 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
* R 9 Orange Orange Red--- Gold = 33\*100 Ohm +/- 5%
* R10 Blue-- Orange Black Gold = 63 * 1 Ohm +/- 5%
* R11 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
* R12 Brown- Black- Green- Gold = 10*100K Ohm +/- 5%
* R13 Brown- Black- Green- Gold = 10*100K Ohm +/- 5%
* SW1 DIP SWITCH
* SW2 -- not installed --
* Q1 2N3904
* Q2 2N3904 ???
* Q3 2N3904
* Q4 2N3904 ???
* Y1 ???
|Color |Digit|Multiplier|
|:------|:---:|---------:|
|Black | 0 | 1 Ohm |
|Brown | 1 | 10 Ohm |
|Red | 2 | 100 Ohm |
|Orange | 3 | 1K Ohm |
|Yellow | 4 | 10K Ohm |
|Green | 5 | 100K Ohm |
|Blue | 6 | 1M Ohm |
|Violet | 7 | 10M Ohm |
|Grey | 8 | |
|White | 9 | |
|Gold | - | x 0.1 |
|Silver | - | x 0.01 |
# == Layout ===
* Component Side:
```
_______________________________________________________________________________
| B2 B1 C8 SW1 ThunderClock Plus |
|R12 R13 Q4 Y1 C7 C4 Q1 |
| D2 1990C CD4050 74LS174 74LS08 74LS132 | A
| Q3 Q2 R3 R2 R1 |
| R4 |
| R11 R7 R5 Sw2 |
| |
| D1 74LS74 74LS109 74LS126 2708 C3 74LS27 | B
| R10 R9 R8 R6 C2 |
| C6 C5 C1 CX |
___________________________________________________ ___|
|_|_|_|_|_|_|_|_|_|_|_|_|
1 25
```
# == Schematic ==
* [ ] TODO
# == Questions ==
* What is Y1 ?
* What is CX ?