UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Series connected stabilizer valves: questions

Bazz4CQJ · 17th Mar 2019, 12:42 pm

Wow! When Skywave said that 'HV' Zeners were poor, I was thinking that 'HV' implied 20V or more. One issue which comes to mind in this context is that of where the temperature change is coming from; ambient air or the power being dissipated by the diode? I found an example on Google, "The temperature drift of the 0.5-W 18-V Zener diode (1N5248A) measured from room temperature to 120°C is about 1.3 Volts". That would appear to be a (hypothetical ?) case where somebody has used a 0.5W diode where a bigger one was surely needed?

B

17th Mar 2019, 12:42 pm	#22
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: Series connected stabilizer valves: questions Wow! When Skywave said that 'HV' Zeners were poor, I was thinking that 'HV' implied 20V or more. One issue which comes to mind in this context is that of where the temperature change is coming from; ambient air or the power being dissipated by the diode? I found an example on Google, "The temperature drift of the 0.5-W 18-V Zener diode (1N5248A) measured from room temperature to 120°C* is about 1.3 Volts*". That would appear to be a (hypothetical ?) case where somebody has used a 0.5W diode where a bigger one was surely needed? B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.