Behringer Xenyx 1202 Power Supply

[GRAHAM99]

I have been given one of these to test out but it does not have a power adaptor.
I think it requires a centre tap power supply with 17v,0v,17v.
I can’t find one anywhere.
Maybe I could buy a suitable transformer to make a power supply?

[N i g e l]

is this the one ?
https://www.andertons.co.uk/behringer-p ... gIThvD_BwE

once you know the part number you can shop around, or look at images showing the label and work out the voltages. Probably a lot easier to just buy the PSU [with UK mains pins of course, if appropriate]

[ef37a]

Yes, 17.5V 0 17.5V AC Behringer part # MXUK5.

I have had two 1202s and they are very good for the money, bit daft operationally but quiet and flexible. Both my supply connectors were unreliable but others have had no trouble with theirs.

Dave.

[GRAHAM99]

Many thanks for this I will get on to it!

[N i g e l]

Yes, 17.5V 0 17.5V AC Behringer part # MXUK5.

I have had two 1202s and they are very good for the money, bit daft operationally but quiet and flexible . Both my supply connectors were unreliable but others have had no trouble with theirs.

Dave.

I have a 1204, its very usefull as a sub mixer & for recording.

There is no block diagram so I had to guess what it could do but as its small that was reasonably straight forward.
The mute does the thing of assigning the channel to aux out 3/4. hmmm ive seen that somewhere else.

It can record accoustic while monitoring on headphones

[GRAHAM99]

I think these adaptors are difficult to get hold of now.
Apparently the EEC outlawed ac to ac adaptors?
Maybe I will have to get a transformer?

[Wonks]

Apparently the EEC outlawed ac to ac adaptors?

I can't find anything to back that statement up. They are after all just transformers in a plastic box, and you can't just ban transformers!

But since 2020 the no-load current to full-load current value of an adapter has been increased, as has the overall minimum energy efficiency value (compared to the required values in force from 2009).

https://eur-lex.europa.eu/legal-content ... 82&from=EN

So it may well be that previous AC/AC adapters that came with products couldn't meet those efficiency values and can no longer be sold in the EU/UK. Either the manufacturers have now come up with more efficient AC/AC adapters for current products, or they dropped those products from their ranges and don't/can't supply replacement power supplies for their older units.

[Hugh Robjohns]

Not outlawed, but there are tighter regulations on efficiency and no-load power consumption. These are very similar to US regulations, I believe.

Replacement PSUs as service spares for legacy products are not affected by the 2019 regulations.

[ef37a]

Apparently the EEC outlawed ac to ac adaptors?

I can't find anything to back that statement up. They are after all just transformers in a plastic box, and you can't just ban transformers!

But since 2020 the no-load current to full-load current value of an adapter has been increased, as has the overall minimum energy efficiency value (compared to the required values in force from 2009).

https://eur-lex.europa.eu/legal-content ... 82&from=EN

So it may well be that previous AC/AC adapters that came with products couldn't meet those efficiency values and can no longer be sold in the EU/UK. Either the manufacturers have now come up with more efficient AC/AC adapters for current products, or they dropped those products from their ranges and don't/can't supply replacement power supplies for their older units.

Wonks, I was told several years ago that AC'AC power supplies (below about 50VA I think?) were "effectively" banned. The problem is I think is that these small transformers draw nearly as much power off load as on and such supplies tend to get left connected to the mains supply.

I was involved in the HT pedal series that originally used a 16V* 800mA AC supply. A 22V DC SMPS was substituted but this needed some creative mods to obtain the correct op amp supplies. The only other option would have been a major redesign of the PSU PCB, not an enviable task as the board also contained the DC-DC converter that produced 300V for the valve.

You cannot run the older pedals on the 22V DC unit but I believe the AC supplies can still be obtained? If anyone is stuck I have ONE NOS they can have.

*This produced around 22V off load, an indication of the inefficiency. (I have had one for years powering my door bell!)

Dave.

[Wonks]

Both up to 49W and above, the off-load power consumption has to be less than 0.21W. Which means the smaller the wattage of the PSU, the harder it is to meet the requirements.

The on-load efficiency requirement is some complicated formula (see the relevant appendix in that document I linked to).

But I have no idea what sort of efficiencies are possible here. Presumably they can be achieved with the right type of transformer.

[ef37a]

Both up to 49W and above, the off-load power consumption has to be less than 0.21W. Which means the smaller the wattage of the PSU, the harder it is to meet the requirements.

The on-load efficiency requirement is some complicated formula (see the relevant appendix in that document I linked to).

But I have no idea what sort of efficiencies are possible here. Presumably they can be achieved with the right type of transformer.

I believe the 'ban' can be sidestepped as it were by fitting a switch in the mains feed. This is of course problematic for very small supplies and safety consideration hard to meet. Modern SMPSUs are now so reliable and cheap that it is probably easier to redesign the gear?

I have in fact fitted an inline SP switch in my 1202 supply.

Dave.

[GRAHAM99]

Still can’t find a power supply!
Maybe I could buy a suitable transformer but it would need to be safely housed etc