R
Retired
Active member
Hi,
Many thanks Raymond for your kind thoughts. Yes indeed the BOSS could have been dead as supplied. It's a negative center pin type that's needed.
It's negative center pin and the one I've bought.
I did try a 9V battery in fact tried two but thought both must be discharged; my DMM was down in the workshop and due to dire weather I didn't fancy venturing down but when I did I found both batteries reading 9V.
As your rightly say Raymond a simple diode possibly only costing less than 1p would protect against wrong polarity connection but in the BOSS manual it states protected. Companies buy diodes in very large quantities costing considerably less than 1p each.
I might still have hundreds of these diodes; I used them a lot during my vintage radio restoration days. I also used Zener diodes for fixing voltages on power supplies such as this one I made; I made two indentical; one for me one for a friend and used Zener diodes together with a wafer swtich to supply 10V increments for powering old battery radios.
I designed and made two of these including winding the transformers. HT 70V to 140V using a wafer switch and Zener diodes supplying 10V increments but also using solid state voltage regulators to supply 0V to 32V in both negative and positive it depended on what the valve grids needed.
I'm OK with the DITTO though and possibly it suits my needs better than the more complicated BOSS so I'm not too bothered; I don't like losing money but sometimes it happens and for the amount involved I won't lose sleep over it.
I wish the weather would improve but I can dream on; it's the wrong time of year with more bad months ahead.
Kind regards, Col.
Many thanks Raymond for your kind thoughts. Yes indeed the BOSS could have been dead as supplied. It's a negative center pin type that's needed.
It's negative center pin and the one I've bought.
I did try a 9V battery in fact tried two but thought both must be discharged; my DMM was down in the workshop and due to dire weather I didn't fancy venturing down but when I did I found both batteries reading 9V.
As your rightly say Raymond a simple diode possibly only costing less than 1p would protect against wrong polarity connection but in the BOSS manual it states protected. Companies buy diodes in very large quantities costing considerably less than 1p each.
I might still have hundreds of these diodes; I used them a lot during my vintage radio restoration days. I also used Zener diodes for fixing voltages on power supplies such as this one I made; I made two indentical; one for me one for a friend and used Zener diodes together with a wafer swtich to supply 10V increments for powering old battery radios.
I designed and made two of these including winding the transformers. HT 70V to 140V using a wafer switch and Zener diodes supplying 10V increments but also using solid state voltage regulators to supply 0V to 32V in both negative and positive it depended on what the valve grids needed.
I'm OK with the DITTO though and possibly it suits my needs better than the more complicated BOSS so I'm not too bothered; I don't like losing money but sometimes it happens and for the amount involved I won't lose sleep over it.
I wish the weather would improve but I can dream on; it's the wrong time of year with more bad months ahead.
Kind regards, Col.
