Great, because they are alot smaller, i can get 1.2uF 5mm Kemet PPS, while i only find 0.33uF PP caps. Now i just need to order these on the side to finish my latest SEN version.
I am enjoying the SEN AD1865. Patrick used really the right word at the beginning of this thread. It is sweet. Mainly the piano really sound like a piano and not something else. I also have a question: when you say that you re-sample for the AD1865, it means that the dac always get 96khz? This can be easily done via software in the pc. What's the advantage to do it via hw?
Thanks,
D
Thanks,
D
> when you say that you re-sample for the AD1865, it means that the dac always get 96khz?
I cannot find where I said that ??
Patrick
I cannot find where I said that ??
Patrick
I think you were saying you were using the PMD100 for resembling before the AD1865.
additionally, do you have some fancy way to monitor the status of the batteries ? I am thinking of putting a transistor hanged with a zener between the poles of the batteries, so that a led is on when the voltage is over 14 V and off when the batteries go below. Still have to work out the details, but it should not be difficult and it look to me the only easy way to have an indication with the supply still floating.
D.
additionally, do you have some fancy way to monitor the status of the batteries ? I am thinking of putting a transistor hanged with a zener between the poles of the batteries, so that a led is on when the voltage is over 14 V and off when the batteries go below. Still have to work out the details, but it should not be difficult and it look to me the only easy way to have an indication with the supply still floating.
D.
Yes we use PMD100, because we like the sound.
But it does not change the sampling rate, just more bits.
I design for 10 hours battery capacity, so it will never be empty before recharge.
If you use lithium rechargeable then there are many management ICs on the market.
Patrick
But it does not change the sampling rate, just more bits.
I design for 10 hours battery capacity, so it will never be empty before recharge.
If you use lithium rechargeable then there are many management ICs on the market.
Patrick
But if you connect the batteries to one of these ic, don't you refer them to ground? My problem is not the monitoring, but keeping them floating.
D.
D.
Aren't they powered by the battery itelf ?
If so Gnd is only defined as the -ve pole of the battery ?
Patrick
If so Gnd is only defined as the -ve pole of the battery ?
Patrick
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
This works well: is 14 V an acceptable lower threshold?
This works well: is 14 V an acceptable lower threshold?
A cascoded version of SEN, using bf862 cascoded by J111 (which EUVL mentioned).
These are cheap and easily available so I parallelized three ... extra matching of those little SOT23 buggers🙄
View attachment JB-SEN-IV-CASCODE.asc
These are cheap and easily available so I parallelized three ... extra matching of those little SOT23 buggers🙄
View attachment JB-SEN-IV-CASCODE.asc
would these circuits work? one's a combination of zen & sen to be used with single supply.
the one on the right is that plus bjt unbalancer.
i want to use them with tda1387- output current of about 0.5mv i believe..
the one on the right is that plus bjt unbalancer.
i want to use them with tda1387- output current of about 0.5mv i believe..
An externally hosted image should be here but it was not working when we last tested it.
I don't know of any practical way in which you can use multiple channels with one power supply.
But it is easy enough to simulate this in Spice to convince yourself.
Patrick
But it is easy enough to simulate this in Spice to convince yourself.
Patrick
There is in principle one possible solution :
You can use a single supply to energise two high power LEDs.
These are then use to generate about 30mA 18V using photovoltaic cells.
The floating photovoltaic cells can then be used to power the IV circuit.
As far as I am concerned, battery is easier.
But Joachim Gerhard has posted a floating supply before (somewhere in this thread ?)
Patrick
You can use a single supply to energise two high power LEDs.
These are then use to generate about 30mA 18V using photovoltaic cells.
The floating photovoltaic cells can then be used to power the IV circuit.
As far as I am concerned, battery is easier.
But Joachim Gerhard has posted a floating supply before (somewhere in this thread ?)
Patrick
Hi Guys,
I'm looking for heatsinks/radiators for SEN/CEN PCB. I wonder if someone has to sell..
Thank you
Artur
I'm looking for heatsinks/radiators for SEN/CEN PCB. I wonder if someone has to sell..
Thank you
Artur
Yikes, i guess the second circuit would def not work since the bjts hav to see opposite phase signals. So i guess make the bottom bjt pnp, right?
First one i will build and see 😀
Wouldt the circuit on the left have no issue with single supply since the i/v resistors tied to v+/v- sees the supply as 'ground'?
I am terribly new at this so apologies in advance for any shortsightedness
First one i will build and see 😀
Wouldt the circuit on the left have no issue with single supply since the i/v resistors tied to v+/v- sees the supply as 'ground'?
I am terribly new at this so apologies in advance for any shortsightedness
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Hi EUVL,
I just get a pair of Idss matched K170/J74 and would like to try your Cen IV. However, my power supply is +-13.6V. Can I use it directly? How to determine the voltage for Cen or Sen? Thanks.
I just get a pair of Idss matched K170/J74 and would like to try your Cen IV. However, my power supply is +-13.6V. Can I use it directly? How to determine the voltage for Cen or Sen? Thanks.
Hi EUVL,
Forgot to mention. My power supply is floating (by a different transformer). It can be seen as 27V power source.
Forgot to mention. My power supply is floating (by a different transformer). It can be seen as 27V power source.