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Std EditionCommodore 64 Computer Saver overvoltage protection circuit simulations

License: CC-BY-NC-SA 3.0

Published Time:2015-09-24 04:47:26
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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For the Commodore 64 overvoltage protection applications, these designs are superceded by Uberclamp: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:

https://easyeda.com/example/The_EasyEDA_Commodore_64_Computer_Saver_PSU_overvoltage_protection_circuit-bS4ECcMXV

https://easyeda.com/example/The_EasyEDA_Precision_Commodore_64_Computer_Saver_PSU_overvoltage_protection_circuit-G3pLJ5Paw

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

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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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