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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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9th Oct 2020, 9:18 am | #1 |
Octode
Join Date: Nov 2003
Location: Bath, Somerset, UK.
Posts: 1,804
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R209 MKII Battery Pack
I had been looking for a way of powering the R209 away from mains powered sources. I had considered something like a motorbike battery then a friend supplied a six used good 18650 Lithium Ion batteries.
I planned to connect six of these in series-parallel to supply 12V at around 5Ah. I had a slim compact Eddystone die cast box to mount everything securely making sure that the batteries were fully isolated from the box whilst being firmly clipped in. The receiver draws 1.3 amps at 12 volts, 1.35 amps when the lamps are on. On no load, the battery pack measures 12V. At switch-on the voltage drops to 11.5V which is within the operational range of the receiver. It is compact enough to fix onto the side and is exceptionally lightweight. Neil
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preserving the recent past, for the distant future. |
9th Oct 2020, 6:28 pm | #2 |
Guest
Posts: n/a
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Re: R209 MKII Battery Pack
How does the set get its HT?
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9th Oct 2020, 8:11 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: R209 MKII Battery Pack
The R209 has a vibrator to provide the necessary 120-volts-or-so of HT (in my case I've replaced the vibrator - which is prone to have its switching-contacts dissolved by sulphurous gases emitted as the rubber vibration-dampers degrade with age - by a couple of TIP3055 transistors in a classic 'Royer' power-oscillator circuit).
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