powering the R2
Dave Martindale <[email protected]>
| Newsgroups | gmane.recreation.radio.hardware.icomr2 |
|---|---|
| Message-ID | <[email protected]> |
> From: Dan Jacobson <[email protected]> >Subject: how do R2 die? > >Let's start my first message to this group off on a morbid note: how >did your last IC-R2 die before you bought another one? My first and only one is still fine. >P.S. Priority watch: I hate the 125 ms dropouts every 5 sec while it >checks the other station. They seem to come just during the critical >parts of the main conversation you are listening to. I don't see how else this could work unless a radio contains two complete receivers. >PS/2 what if I'm tired of batteries and weld transformer wires to the >battery contacts. I suppose I need a 'torid' to wrap around the line >in or else I will hear transformer hum? Maybe change the Subject if >you just answer this. First, it needs DC, not AC. Connecting AC might well create the need to buy a new R2. Second, most DC-output "wall wart" power supplies have a lot of ripple in their output voltage under load. Since the R2's audio amplifier is powered directly from the battery voltage, there will be 120 Hz hum in the output if you use one of these supplies. However, the R2 will probably continue to work. Most of the rest of its circuitry is powered by a DC-DC converter followed by voltage regulators, so most circuitry will get constant supply voltage. Third, a toroid is useful for attenuating RF-frequency AC on power wires, but it's not going to do anything at all for 120 Hz hum. To get hum-free operation from wall power, use a wall wart with a regulated output voltage. Dave ------------------------ Yahoo! Groups Sponsor ---------------------~--> Make Money Online Auctions! Make $500.00 or We Will Give You Thirty Dollars for Trying! http://us.click.yahoo.com/yMx78A/fNtFAA/46VHAA/ELTolB/TM ---------------------------------------------------------------------~-> Post message: [email protected] Subscribe: [email protected] Unsubscribe: [email protected] List owner: [email protected] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/