Oakley TM3030 Скачать руководство пользователя страница 21 | Manualshive

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Oakley TM3030 Скачать руководство пользователя страница 21

Fitting an Internal Mains Transformer

I do not endorse, nor recommend, any method that uses the direct powering of any Oakley
equipment with the mains supply. It is up to you to use your PCB wisely and to make sure you
make your project in a safe manner. Furthermore you should ensure that the finished project is
safe to any persons who are using it. Oakley Sound Systems cannot take any responsibility for
what you do with your TM3030 PCB.

The following advice is only for those who know how to wire mains rated equipment safely. If
you do not know how to do this then make no attempt to do so. The following information,
provided in italics, is the only information I am prepared to give regarding direct mains supply
for the TM3030.

Transformer rating; Secondary or secondaries: 15-0 or 7.5-0-7.5 @ 3VA minimum

Do not connect the common of any dual secondary windings to ground. Winding end wires
go to pin 1 and pin 2 of the connector marked AC power. Neither pin 1 or pin 2 should be
connected to ground.

C16 should be adequately rated for the input voltage you are using. ie. At least equal to
1.4xVac. Where Vac is the

maximum

output RMS voltage of the transformer.

Line fuse; T250mA

All mains carrying conductors must be suitably insulated and mounted away from the low
voltage parts of the unit.

All parts of the metal case MUST be connected to mains safety earth. A suitable and secure
bonding point must be made to the case. Note that the case's paint or other coating should be
removed from around the bonding point to ensure that the metalwork is making a good
contact to the bonding point hardware. The bonding point should then be connected via a
suitably thick piece of wire back to the earth terminal of the IEC socket or earth inlet
connection.

If you have used a laminated EI transformer, ie. not a toroid, then you should earth the
exposed metal frame of the transformer.

The 0V on the TM3030 circuit board should also be tied to earth. This should be done using
a piece of insulated wire connecting the earth bonding point to the GND pad on the board.
In this instance only it may be preferable to use a plastic audio jack socket and leave floating
the sleeve pin on the midi output socket.

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Содержание TM3030

Страница 1: ...Oakley Sound Systems TM3030 PCB Issue 3 Builder s Guide V3 3 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...

Страница 2: ...und com tm3030 htm For general information regarding where to get parts and suggested part numbers please see our useful Parts Guide at the project webpage or http www oakleysound com parts pdf For ge...

Страница 3: ...out for the pitch spacing as the board is laid out to accept 0 3 7 5mm for these devices The horizontal preset or trimmer resistors are just ordinary carbon types No need to buy the expensive cermet...

Страница 4: ...the two types Q18 is also a 2SK30A Y device You should seek out this part if you want the envelopes to behave in the same way as the original Y types are easier to get hold of than O types and various...

Страница 5: ...hance that they will be matched well enough for this application Modern fabrication methods are much better than they used to be The VCA circuit also allows the builder some choice in the construction...

Страница 6: ...he panel More detail about mounting the LEDs is given on this later on this document Many manufacturers do ready made preformed LEDs in little plastic boxes These may be perfect for the job but be car...

Страница 7: ...not let either of the input power leads connect to the chassis Sometimes people like to substitute parts in place of my own recommendations Feel free to do this but remember that there is normally a...

Страница 8: ...88 R89 R113 R14 R61 R42 220R R1 R9 R10 1K R4 R117 R104 R84 R31 R64 1K5 R106 1K8 1 metal film R85 2K2 R12 R29 R109 R112 R107 R110 R63 R44 R43 R94 R59 R58 R80 2K2 1 metal film R91 3K3 1 metal film R40 3...

Страница 9: ...elect C54 C48 C27 C38 C36 C50 C17 C18 C25 22uF 35V elect C4 C3 47uF 35V elect C45 C26 C39 C40 470uF 35V elect C16 Discrete Semiconductors 1N4004 power diode D7 D6 D4 D3 1N4148 signal diode D2 D14 D1 D...

Страница 10: ...ith seven matching brackets Note Alpha and ALPS use A and B suffixes on their pot values A log and B linear 1M log DECAY 50K lin TUNE ENV_MOD FREQUENCY ACCENT 50K lin x 2 dual gang RESONANCE 50K log V...

Страница 11: ...it board A small gap of around 1mm is recommended 2 The positive temperature coefficient PTC resistor is mounted so that is lies across the top of U6 This is to ensure that both it and U6 are at the s...

Страница 12: ...onnecting them is to tie them together with a cable tie as seen in the photograph below Two BC550B transistors face to face and fixed together with a simple cable tie Again a small amount of heat cond...

Страница 13: ...and B linear So a 1MA is a 1 megohm log pot The four front panel mounted LEDs must be fitted carefully if you are using the directly mounted technique Although this sounds fiddly it s actually quite...

Страница 14: ...table switch should fit tightly into its respective holes on the board You may need to use a pair of fine nosed pliers to help the flexible gold pins into the board holes Make sure the switch body is...

Страница 15: ...press for details of this service but don t expect it to be cheap A Schaeffer FPD file can be found on the TM3030 s project webpage which can be downloaded and edited If printed out at 100 size and in...

Страница 16: ...of the case underneath the PCB and connected to the GND pad of the TM3030 Do not connect your screening to any lug of the power pack inlet socket though When using any metal case it is essential that...

Страница 17: ...oard back to the bonding point There is little more information about using internal mains transformers later in this document I should stress that building a component level mains transformer into an...

Страница 18: ...y Remember to keep all wires as short as you can but allow for a little extra so that no wire will ever become taut I usually tin the bare wire ends with a bit of solder before I place the wire into t...

Страница 19: ...is the earth or ground of the signal Now if you have used a socket with a metal bush and securing nut and have a metal case then the jack socket will have grounded your case By grounding your metal c...

Страница 20: ...in 4 on socket Pin 2 on PCB goes to Pin 2 on socket Pin 3 on PCB goes to Pin 5 on socket If you have used a plastic audio output socket then you should also connect pin 2 on the midi output socket to...

Страница 21: ...nd C16 should be adequately rated for the input voltage you are using ie At least equal to 1 4xVac Where Vac is the maximum output RMS voltage of the transformer Line fuse T250mA All mains carrying co...

Страница 22: ...Bs or whole modules You will be charged for all postage costs any parts used and my time at 25GBP per hour Most faults can be found and fixed within one hour and I normally return modules within a wee...

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