Tried it like this as vref, but could not get it enough stable vout. Not much voltage fluctuation, but I preferred the leds for safety sake. Just try some leds to get your desired vout. As there are many led manufactures and you may find that you need different ones than what I used.
I have simulated and practically tested that option during the prototyping. It bootstraps in the low band creating unevenness in the impedance shape, gives some notch also that needs high ESR added with a resistor to fill out, but it does not improve PSRR above 1MHz due to ESL, ESR. Sounded a bit muffled subjectively.
how much current would 1 shunt consume with 50vac trafo, 5v drop to regulation? currently have a 1543 dac running on 3 shunts, 3 separate trafos. i'm concerned about my electric bill.
The ccs current setting times the raw dcV at the rectifier is your consumption Watts plus some loss in the trafo etc. say 10%
There some cheap digital display power meters/sockers in the stores and on ebay also, very handy. You can monitor everything in the house. But don't leave such a device in the audio power line permanetly, it has significant impedance.
Hi Salas,
Have just finished making 2 BiBs for a DAC board, was very impressed by its performance. Now I want to try out the Reflektor, about to buy parts.
For the 2n4403 transistors, can I replace it with hn3a51F? It's a dual transistor, so it's factory matched out of the gate ( wanted to avoid having to hand match parts ), and I read somewhere that it has lower noise spec than 2sa970.
Have just finished making 2 BiBs for a DAC board, was very impressed by its performance. Now I want to try out the Reflektor, about to buy parts.
For the 2n4403 transistors, can I replace it with hn3a51F? It's a dual transistor, so it's factory matched out of the gate ( wanted to avoid having to hand match parts ), and I read somewhere that it has lower noise spec than 2sa970.
Wow. Thanks for the lightning fast response Salas.
Just ordered a couple of these now from Digikey. All that's left is the wait for the shipping. 🙂
Just ordered a couple of these now from Digikey. All that's left is the wait for the shipping. 🙂
Are you going to make relatively low voltage Reflektor? Bcs in higher voltages the lower transistor legs of the mirror will see some dissipation that SMD parts don't like.
Need one 5V and a 5.2V reg for my application. Would that be a concern? I could probably put a small heatsink on top if necessary
Show us what you made in the end. Use good low Vgs high gfs low capacitance part as output MOSFET like those we discussed here extensively in the past.
Hmm ... maybe I'm getting ahead of myself with the Reflektor, looks like I have a problem with the BiB.
I have two BiB supplies... one of them continuously creeps .01V after every 5 seconds or so. Doesn't show any signs of stopping even after 5 minutes. The other one continuously loses voltage after initial ramp up; after achieving the set voltage it decreases bit by bit. At start it reaches 5.2V or so (my target voltage), after a while it gets down to 4.9V. I shut it down after that as the target board has a 4.8V minimum requirement.
Any suggestions on where to start looking?
Additional details:
Both BiB supplies use BJT pass transistors. Gate stoppers for CCS MOSFET and BJT are both takman carbon resistors. Currently have a 330uF 50V Silmic II as Vref cap. Instead of output Zobel I have a 47uF Panasonic Pureism cap.
I have two BiB supplies... one of them continuously creeps .01V after every 5 seconds or so. Doesn't show any signs of stopping even after 5 minutes. The other one continuously loses voltage after initial ramp up; after achieving the set voltage it decreases bit by bit. At start it reaches 5.2V or so (my target voltage), after a while it gets down to 4.9V. I shut it down after that as the target board has a 4.8V minimum requirement.
Any suggestions on where to start looking?
Additional details:
Both BiB supplies use BJT pass transistors. Gate stoppers for CCS MOSFET and BJT are both takman carbon resistors. Currently have a 330uF 50V Silmic II as Vref cap. Instead of output Zobel I have a 47uF Panasonic Pureism cap.
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