briggs wrote:Looking at the power supply - it requires 16VAC. Do you reckon you could glean this from a standard laptop supply, like this: http://www.notebook-ac-adapter.com/product_info.php?language=en¤cy=GBP&products_id=1119
One other thing - how are they getting power to those heaters? Just tapping straight off of the 16VAC line with a voltage dropping resistor?
Ice-9 wrote:briggs wrote:Looking at the power supply - it requires 16VAC. Do you reckon you could glean this from a standard laptop supply, like this: http://www.notebook-ac-adapter.com/product_info.php?language=en¤cy=GBP&products_id=1119
One other thing - how are they getting power to those heaters? Just tapping straight off of the 16VAC line with a voltage dropping resistor?
Yeah ! the heater voltage is taken from the 16V ac input through the negative diode rectifier then dropped with a 16 Ohm resistor.
Ice-9 wrote:Ice-9 wrote:briggs wrote:Looking at the power supply - it requires 16VAC. Do you reckon you could glean this from a standard laptop supply, like this: http://www.notebook-ac-adapter.com/product_info.php?language=en¤cy=GBP&products_id=1119
One other thing - how are they getting power to those heaters? Just tapping straight off of the 16VAC line with a voltage dropping resistor?
Yeah ! the heater voltage is taken from the 16V ac input through the negative diode rectifier then dropped with a 16 Ohm resistor.
small correction to my post, The 12v for the heater is taken from the output of the 7915 -15v reg and dropped with a 15Ohm resistor. I will try and do a schematic fot the complete psu section and post it up.
bajaman wrote:IMPORTANT - please read
Earlier in this thread i posted a schematic for the Blackstar HT SMPS power supply.
Unfortunately there is an error - The diode SB246 is actually a 2 amp schottky barrier diode SB240.
I have successfully used a 1N5819 1A schottky in a working version of this power supply.
So the schematic (except for this minor typo) is verified and delivers 305v DC unloaded at the output.
I have designed and built a prototype of this supply on a piece of single sided fibreglass PCB.
I shall publish it in the Ready to Build section of the forum in the next few days.
cheers
Steve
Ahha, okay! What sort of voltages are you getting with the nixie? ~260V is what I'm after?
bajaman wrote:...it whistles like a bitch at about 17Khz or thereabouts.
...I need to revisit the Blackstar power supply and perhaps increase the oscillator frequency above human hearing - i have tried shielding it but cannot reduce that damned whistle completely.
bajaman
teemuk wrote:Let's keep this one rolling....
Here's the tube board (attachment). Some component values are missing because they couldn't be interpreted from the photos available. Also, I can't quite interprete whether the heaters were wired for 12V or 6,3V.
I'm reverse engineering the control board schematic ATM but I need photos showing how the traces run under the potentiometers (on component side). The whole circuit is kinda odd looking so the ISF patent offers only little help...
Pictures of that small switch board would also help.
Cool forum by the way...
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