+12V for VG93 — ZXNet «hardware.zx»

From Igor Afonkin To All 16 January 2006

Hello, Jukov Juk> Cunningly invented. Is it possible to connect the anode of the zener diode to the common Juk> wire, if you take it to a voltage of 12V? It's possible. But, IMHO, there were no domestic ones for 12V, they were installed in series 2 pcs. at 6V... There seem to be imported ones, but does it make sense?

From Kamil Karimov To All 16 January 2006

Hello, Jukov Juk> Cunningly invented. Is it possible to connect the anode of the zener diode to the common Juk> wire, if you take it to a voltage of 12V? No. This circuit provides +5 volts to the VG93 terminals immediately after turning on the power. Then, with a slight delay, the voltage at pin 40 becomes equal to 12 volts Even if the converter is not working, the +5 volt supply protects VG93 from burnout. Although for VG93 the more dangerous option is when 12 volts are supplied in the absence of 5. But in this circuit this case is excluded, since in the absence of 5 volts there is no it will be 12.

From Kamil Karimov To All 16 January 2006

Hello jdigreze jdi> You can. But, IMHO, there were no domestic ones for 12V, they installed jdi> 2 pcs in series. at 6V... It seems there are imported ones, but are there jdi> meaning? 1972 Diode Handbook: D814G - 10 - 12 volts D814D - 11.5 - 14 volts KS211B - 11 volts +- 20%

From Konstantin Zhukov To All 16 January 2006

Hello Yaroslav Yar> So look where the anode of the zener diode is connected. With this connection scheme Yar> it turns out 5+6.8=11.8V Yar> It's a clever idea. Is it possible to connect the anode of the zener diode to the common wire if take it to 12V voltage?

From Kamil Karimov To All 16 January 2006

Hello, CHRV CHR> At that time (and even now) the main thing was maximum cheapness - and this CHR> it means there will be such perversions. But here Roman I don’t agree :) This is a key voltage inverter and a simple parallel stabilizer. If everything is calculated correctly, it works without problems.

From Konstantin Zhukov To All 16 January 2006

Hello caro car> 1972 Diode Handbook: car> D814G - 10 - 12 volts car> D814D - 11.5 - 14 volts car> KS211B - 11 volts +- 20% Yes, yes, I have a lot of this kind of crap. But in the light of new facts, probably It’s worth trying D814A - 7...8.5V or D815B - 6.8V. Thanks everyone for your help!

From Chunin Roman To All 16 January 2006

Hello caro car> And here I don’t agree with Roman :) car> This is a key voltage inverter and a simple parallel stabilizer. car> If everything is calculated correctly, it works without problems. Well, this is for LVD - he did not agree :). To be honest, I don’t know how to calculate such things, it’s still old school... ;).