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Of coursewyerd wrote:Looking good Mark! Will you be posting circuit diagrams and a parts list as I'd like to make a 110v version?
Great. Thank you.1024MAK wrote:Of coursewyerd wrote:Looking good Mark! Will you be posting circuit diagrams and a parts list as I'd like to make a 110v version?
The only differences between a 230V (220V to 240V) and a 110V to 120V version are the mains transformer, the mains on/off switch (which has a neon in it) and the current rating of the mains input fuse (I suggest a 2A instead of a 1A for 110V to 120V mains).
Mark
1024MAK wrote:If you grab a time machine and visit Memofest 2014 you can/could of seen it powering a real MTX computer
Mark
Code: Select all
Circuit Ref Part Details Manufacturer SupplierSuppliers QTY Price Pack PK QY PKs Notes
Resistors:
R1 100Ω 5% 250mW metal film or 0.5W or 1W metalVishay: MBB02070Rapid 62-7446 1 £0.03 £2.68 100 1 100r Mrs25 1% Metal Film Resistor - Pack of 100
R2 1.2kΩ 5% 250mW metal film or 250mW carbon f Rapid 62-2102 1 £0.02 £1.71 100 1 1k2 0.6w Metal Film Resistor - Pack of 100
Capacitors:
C1 2200uF 16V electrolytic, 5mm pitch/spacing Rapid 11-0300 1 £0.34 £0.34 1 1 85°C 2200U 16V Radial Lead Aluminium Electrolyti
C2 100nF ceramic multilayer, 5mm pitch/spacing Rapid 11-3454 1 £0.03 £0.03 1 1 0.1uF +/-20% 50V Y5V P:5.08mm Radial Ceramic Ca
Diodes:
D1, D2 1N4001 or 1N4002 or a higher voltage rating 1N4001 Rapid 47-3130 2 £0.09 £0.04 1 2 1N4001
LEDs:
LED1 5mm standard green LED Kingbright L-53GRapid 55-0868 1 £0.06 £0.06 1 1 Kingbright L-53GD 5mm Green LED Diffused 30mcd
Suitable panel mounting plastic clip Kingbright: RTF5Rapid 55-0260 1 £0.21 £0.21 1 1 Kingbright LED Bezel Clip (Prominent) 5mm
Modules:
LM2577 step-up DC-DC converter. eBay/che'261211800 1 £1.63 £1.63 1 1 LM2577 DC to DC Adjustable Converter Step-up Cir
I used a Chenyao19870517 LM2577 DC to DC adj
Set the output voltage to 16V before fitting
Fuses:
F1 1A A/S or T (suitable for fused IEC chassis Siba: 70-007-65/Rapid 26-0386 1 £0.16 £0.16 1 1 1A 20x5mm Antisurge Ceramic Fuse
F2 5A A/S or T 20mm x 5mm Eska: 522.524 5ARapid 54-3160 1 £0.08 £0.76 10 1 ESKA 522.524 5A Slow Blow Glass Fuse 5x20mm
Panel mounting fuse holder suitable for the CamdenBoss: CFH0Rapid 26-0191 1 £0.48 £0.48 1 1 Low Profile Fuseholder
Insulation Boot for above Bulgin: 11327 Rapid 26-0187 1 £0.46 £0.46 1 1 Insulation Boot Medium
F3 1A A/S anti-surge/T time delay 20mm x 5mm Eska: 522.517 1ARapid 54-3146 1 £0.08 £0.76 10 1 ESKA 522.517 1A Slow Blow Glass Fuse 5x20mm
PCB fuse clips, 5mm pin pitch, suitable for ESKA: 120.800H Rapid 49-0536 2 £0.12 £0.06 1 2 ESKA 120.800H Fuse Clip For 5x20mm Fuses 6.3A
Transformer
T1 50VA 230V primary, twin 7.5V secondary windiVigortronix: VTXRapid 88-3928 1£12.38£12.38 1 1 Vigortronix Chassis Transformer 230V 50VA 7.5V+7
Switch:
SW1 Miniature red neon mains dual pole rocker swSCI: R13-73C-02 Rapid 75-0300 1 £0.96 £0.96 1 1 DPST Illuminated Rocker Switch
Socket:
SKT1 Fused IEC Chassis Plug Inalways: 0717-CRapid 23-2100 1 £0.91 £0.91 1 1 Fused IEC Chassis Plug, takes 20mm X 5mm fuse
Plug:
PLG1 6 pin DIN plug suitable for the MTX TruConnect Rapid 20-0280 1 £0.34 £0.34 1 1 6 Way Insulated DIN Plug
Miscellaneous items:
ABS plastic box (or a suitable metal box). Bradford ConsultMaplin KC89W 1 £7.74 £7.74 1 1 Plastic Box MB7 Black 177x120x83mm
Strip board 1 1
Various sizes of heat shrink (to insulate an
Small cable ties 100 1
M4 countersunk machine screws, washers, and 2
M4 Solder tag (for the earth connection to tPJP: C4 Rapid 33-1815 2 £0.09 £4.39 100 1 Solder Tags Plated M4 Pack Of 100
M3 machine screws, washers, and nuts to fix 4
Circular Spacers M3, 4mm long PJP: EL4Ø3 Rapid 33-3611 4 £0.21 £5.34 100 4 Circular Spacers M3 4mm Pack Of 100
Countersunk M3 nylon machine screws to hold Anixter: 0040411Rapid 33-5042 2 £0.06 £3.15 100 2 Countersunk Head Slotted Metric Machine Screws M
Countersunk M3 nylon nuts to hold the IEC maAnixter: 0080729Rapid 33-5072 2 £0.06 £3.10 100 2 M3 Nylon Nuts Pack 100
Mains rated, stranded equipment wire 16/0.2m Rapid Equipment Wire 16/0.2mm
Stranded equipment wire 7/0.2mm, rated at 1. Rapid 01-0108 £1.53 £1.53 Equipment Wire 7/0.2mm
Stranded equipment wire 24/0.2mm, rated at 4 Rapid 01-1100 24/0.2mm Equipment Wire
6 core cable rated at 1.4A or better, lengthKabeltronik: 095Rapid 49-0478 2 £2.26 £1.13 1 2 Kabeltronik 095062409 UL-LiYY 6 x AWG 24 Unshiel