Re: Correct switch and wiring
Tomtoggle quoted messageShow quoted text
Please understand, I'm not being condescending - your comments make me think you're electrical background is minimal so I'll lay it out step by step.
Start by considering your booster - what is it's maximum current output? I said I assumed 5A, because you hadn't mentioned a current or a model number. Since two of your contact sets on the rotary must switch this current if you are to put the RRAmpMeter in the primary feed from the booster, that defines your current rating for the rotary.
Sketching out your needed circuit, I think you need to switch a lot more circuit points than you realize - up to 10, I think. So you need a 10P6T rotary, 5A rated. If you find one, I'll bet it's straight off the ark or some form of military special. I've never seen one in action, in 35 years in the electronics business.
That being said, one is still "available" at Digi-key, though not in stock:
$829 - neat. Chump change for sure.
If you want a thousand, Electroswitch might must make them for you, but otherwise I would not expect to be able to order this with a predictable delivery date, so start looking for someone who has one.
To re-explain my relay solution - a single-pole 100 ma 6-position rotary energizes one DPDT relay in each position, except for the "no RRAmpMeter" position, which simply ignores the RRAmpMeter. Each DPDT relay switches the RRAmpMeter into the circuit it selects. Otherwise, the circuit for that position is in its normal configuration. Since the rotary is break-before-make, only one relay is ever energized, ensuring no shorts occur. Easy, simple to wire, maintain, and understand.
Total relay cost (ignoring sockets) on the surplus market is around $5 ea, for a total of $25 plus the rotary at around $5, for a total outlay of $30 to do what you want. Socket the relays, and the price might jump to $100. Still a whack of a lot less than "unobtainium", which is what I would call the Electroswitch offering.
Or, you can buy 5 RRAmpMeters and be done with it; again, cheaper than unobtanium, but more expensive than the relay solution. Depends on how you value your time.
I am sure someone can identify some surplus outlet or obscure supplier with a 10P6T 5A rotary in stock for peanuts - but that's not my point.
On 14/12/28 07:41, Blair & Rasa wrote: