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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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16th Dec 2010, 6:21 pm | #1 |
Retired Dormant Member
Join Date: Nov 2010
Location: Meopham, Kent.
Posts: 2
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Inverter output voltage drop
Hi I am new to this forum so please bear with me. For some years I have been interested in the replacement of HT batteries. I have built an inverter from an unpublished 4047 driven MOSFET circuit. The original contained a 10 va transformer and gave excellent results. Using the same components I have introduced a 1.6va transformer. A 6v input gives approx 130v off load but when connected to radio this falls to 36v and does not work set. Can anyone advise what I am missing here. Many thanks. Merry Christmas.
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16th Dec 2010, 8:45 pm | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
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Re: Inverter output voltage drop
Volt drop in the transformer windings? Does the set work on batteries?
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
16th Dec 2010, 8:57 pm | #3 |
Heptode
Join Date: Sep 2010
Location: Hythe, Hampshire, UK.
Posts: 626
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Re: Inverter output voltage drop
Have you put a resitive load on the output of the inverter to draw about 13mA to see if the voltage drops to that when the set is connected? If it does it is losses in the circuit - if it doesn't it's most likely there is a fault in the set i.e. leaky capacitors.
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16th Dec 2010, 8:59 pm | #4 |
Octode
Join Date: Oct 2003
Location: Newbury, Berkshire, UK.
Posts: 1,770
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Re: Inverter output voltage drop
Hi Batterymax
And welcome to the forum. Nothing really to add to the comments already made by Station X. You are more likely to get some further help if you can post a circuit
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Chris |
16th Dec 2010, 9:07 pm | #5 |
Retired Dormant Member
Join Date: Aug 2010
Location: Mareeba, Queensland, Australia.
Posts: 140
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Re: Inverter output voltage drop
A circuit would be nice
BUT from the sound of it, there is no compensation circuit, i.e. a circuit that measures the voltage drop and as it compensates, it restores the voltage. Joe |
18th Dec 2010, 5:43 pm | #6 |
Retired Dormant Member
Join Date: Nov 2010
Location: Meopham, Kent.
Posts: 2
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Re: Inverter output voltage drop
Thank you all. I will post a circuit a.s.a.p. but methinks compensation circuit is the key. I am trying to fit this into a B114 package!
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