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Old 15th April 2019, 02:38 PM   #11
Salas is offline Salas  Greece
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Quote:
Originally Posted by jackinnj View Post
In a similar vein, you can bias a pair of MOSFETs the Blue LED will get Q2 into its linear region -- this is an adaptation of "Art of Electronics", Volume 3. Figure 9.110. You could use a resistor to bias the LED at the expense of PSRR. If the resistor values are successively doubled, you can get 8-bit resolution.
Good for HV
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Old 15th April 2019, 04:04 PM   #12
PKI is offline PKI  United States
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Can this be used if someone wants a regulated tube heater PSU?
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Old 15th April 2019, 04:16 PM   #13
Salas is offline Salas  Greece
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Yes, tube heaters PSU is one of the uses I wanted to mention and I forgot.
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Old 15th April 2019, 04:42 PM   #14
carlthess40 is offline carlthess40  United States
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Could this be made to run a baby Huey EL84
Tube amp pcb ? It has 1 pre tube and 2 power tubes for one channel
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Old 15th April 2019, 04:51 PM   #15
Salas is offline Salas  Greece
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It can run anything between 1.5V and 20V for enough Amps of current. Because heaters will be a constant load you can predict your trafo, your ripple loss, and your sinking scheme pretty accurately. 3A at 6.3V is four EL84s plus a couple of drivers is surely doable. Say 8W dissipation for 2.5V across Q4.

You see those side notches. They are to help you mount the diodes and the big transistor on a back surface also. In other words on a potent external sink if needed. Like a solid state amp against a flat sink with its big semis mounted under the PCB edges. He he, now a PSU with a notch and a status bar. Trendy.
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Old 15th April 2019, 11:06 PM   #16
derekr is offline derekr  Barbados
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Now thatís quick work, sir! Thanks, appreciate the effort. Will it be sold complete with parts - or a mini kit? Any idea of pricing?
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Old 15th April 2019, 11:25 PM   #17
Salas is offline Salas  Greece
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That's Tea's area of expertise. Ask him later on. Me I will just send him a finalized PCB design with typical BOM to include in his next GB the soonest I feel I haven't missed the odd mechanical detail to include. Meanwhile I will continue with tests and beta tests acquiring various apps experience and third party feedback from local DIY friends that I will hand most of my few proto green PCBs to. So we can build a better knowledge base on what is best to use it for and what's enough trafo/bridge diodes/reservoir caps/sinks to configure in each case. Because the range of gear it can probably serve instead of their own fixed voltage SMPS bricks seems very wide.
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Old 16th April 2019, 12:29 AM   #18
jameshillj is offline jameshillj  Australia
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Could this be extended up to 24V dc and about 3A for the various First Watt amps?
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Old 16th April 2019, 12:51 AM   #19
Salas is offline Salas  Greece
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If you will use a higher value VR1 trimmer or a Zener in its place (cathode towards the LEDs), yes. When you don't jumper any side pins all LEDs are full on and the 500R trimmer offers 2.5V extra trim range. Whole Vref is fed with 5mA constant current. Maxing out at 20V output as it is after one Vbe is deducted via an output transistor.
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Old 16th April 2019, 01:02 AM   #20
jameshillj is offline jameshillj  Australia
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Thanks for that - so simple.
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