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Commodore 64 Computer Saver overvoltage protection circuit simulations

4 years ago 3996
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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For the Commodore 64 overvoltage protection applications, these designs are superceded by Uberclamp: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'

TL431 based clamp

Zener based clamp

The EasyEDA C64 Overvoltage Protection Circuit (simulation schematic)

The EasyEDA Precision C64 Overvoltage Protection Circuit (simulation schematic)

BOM

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

Attachments

Filename Download
Simulation_of_the_original_Ray_Carlsen_overvoltage_switch.docx

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Comments (1)

martin garix (martin) Reply

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