V - can you provide a simple circuit for using the LM358? Thanks, bob


----- Original Message -----
From: "V" <lights@...>
To: "g0aqi" <microelectricitygermkiller2@yahoogroups.com>
Sent: Wednesday, June 25, 2008 6:06 PM
Subject: Re: [microelectricitygermkiller2] Polarity swapping


> Hi g0aqi,
>
> If you use a different chip you can do it much easier. just one chip one
> capacitor and three resistors and you are in business.
>
> The chip is an LM358
>
> It will totally flip it for you.
>
> Take care,
> V
>
>
>> Hello everyone.
>>
>> Sorry to be a pain but, in spite of Bg's efforts to put some photo's
>> in the group files, I'm having trouble getting my head around it
>> all. I want to be able to flip the polarity of various voltages,
>> (all low..) and a simple miniature relay change-over timer circuit
>> would enable me to do this, rather than what I see featured in the
>> files.
>> I need to find a simple schematic using a 555 timer chip which will
>> do this.
>> The 555 switches on for a while then switches off for a while I
>> understand the 555 won't flip polarity on it's own, hence the relay -
>> A minature Double pole changeover relay, driven by the timer WILL do
>> this.
>
>> I've looked at various sites featuring the 555 timer but can't quite
>> get my head around the various terminology and can't see a simple
>> enough circuit.
>>
>> Can anyone give me a hand on this?
>>
>> This seems really fundamental to group experiments in this area and
>> I'm sure that there will be others wanting something similar.
>
>> Having a relay there with totally independent contacts means that one
>> can use any voltage and not rely on the timer chip circuit.
>>
>> Cheers.
>>
>> Ed
>
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