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Std EditionCommodore 64 Computer Saver overvoltage protection circuit simulations
License: CC-BY-NC-SA 3.0
Description
For the Commodore 64 overvoltage protection applications, these designs are superceded by Uberclamp:
https://easyeda.com/example/Uberclamp_simulation-RzsmgyQ8q
This project compares the Carlsen Electronics 'C64 Saver' circuit for use with the Commodore C64 power supply bricks with a more reliable design developed for EasyEDA by signality.co.uk.
Both versions are simulated and show that the EasyEDA design offers more reliable protection.
A (non-simulation) schematics, Bills of Materials and PCB layouts of the zener based and the Precision TL431 based EasyEDA designs are available in these projects:
Please note that the internal design of the 5V part of the C64 PSU used in these simulations comes from:
http://jayakody2000lk.blogspot.co.uk/2013/03/refurbish-c64-power-supply-unit.html
Documents
Carlsen Electronics 'C64 Saver'
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TL431 based clamp
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Zener based clamp
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The EasyEDA C64 Overvoltage Protection Circuit (simulation schematic)
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The EasyEDA Precision C64 Overvoltage Protection Circuit (simulation schematic)
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Carlsen type computer saver response to input overvoltage
Open in editor| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 2N2222 | Q1,Q2 | SOT23 | 2 |
| 2 | 1N4001 | D2,D5,D6 | DO35-7 | 3 |
| 3 | SINE(0 {8.5*sqrt(2)} 50 0 0 90) | V1 | 2P-5.0 | 1 |
| 4 | DI_BZT52C4V7 | D1 | SOD123 | 1 |
| 5 | PULSE(0 1 {time_to_fault} 1u) | V2 | 2P-5.0 | 1 |
| 6 | 1k | R4,R6 | R3 | 2 |
| 7 | LED | DOVFAULT,DV5VC64OK | LED3MM | 2 |
| 8 | {R1val} | R1 | R3 | 1 |
| 9 | {R2val} | R2 | R3 | 1 |
| 10 | 2.2k | R3 | R3 | 1 |
| 11 | {Rfbval} | RFB | R3 | 1 |
| 12 | {Cslugval} | CSLUG | 1206 | 1 |
| 13 | LM7805EE | U1 | TO220 | 1 |
| 14 | Voltage_Controlled_Switch | S1 | NONE | 1 |
| 15 | 220 | R7 | R3 | 1 |
| 16 | 6.8 | R8 | R3 | 1 |
| 17 | SINE(0 {8.5*sqrt(2)} 50 0 0 270) | V3 | 2P-5.0 | 1 |
| 18 | 4700u | C1 | CP_8X13MM | 1 |
| 19 | {5/Iload} | RC64LOAD | R3 | 1 |
| 20 | {Cint} | C2 | CP_8X13MM | 1 |
| 21 | 7 | V4 | 2P-5.0 | 1 |
| 22 | 100u | C3,C5,C6 | CP_8X13MM | 3 |
| 23 | 100m | R5,R6,R1,R9 | RC07 | 4 |
| 24 | RELAY_SPDT_EE | RLY1 | NONE | 1 |
| 25 | TL431 | U1,U2 | TL431AILP_TO92_TRIPOD | 2 |
| 26 | 1.5k | R1 | RC07 | 1 |
| 27 | 220n | C1,C3,C4 | C_MLCC_RES_DIP_5.5x3mm_P5mm | 3 |
| 28 | QBC557B | Q1 | BC557 | 1 |
| 29 | 100 | R2,RLOAD | RC07 | 2 |
| 30 | 1k | R3,R5,R6,R4 | RC07 | 4 |
| 31 | STP36NF06L | M1 | SOT23 | 1 |
| 32 | SIN(4.75 4.25 50) | V1 | 2P-5.0 | 1 |
| 33 | Ammeter | A1,A2 | NONE | 2 |
| 34 | FUSE | F1 | NONE | 1 |
| 35 | 1n | C2,C5 | C_MLCC_RES_DIP_5.5x3mm_P5mm | 2 |
| 36 | DI_BZT52C5V6 | D1,D2 | SOD123 | 2 |
| 37 | LED | DFAULT | LED3MM | 1 |
| 38 | LED | D5VC64OK | LED3MM | 1 |
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