IC-7000 ACC socket to drive relays

[W1zardsleeve]

Hi Im installing my IC-7000 in my car that has an aftermarket audio system with audio amplifiers. I have just tested running the speaker out jack on the back of my IC-7000 in to the front speaker amp and that works quite nicely but has a side effect of stopping the music coming out of the front speakers when connected via RCA Y lead when the ICOM is switched on. Im assuming that is due to something not liking the load it is driving when the ICOM and the head unit is connected at the same time. So im planning on making an automatic switcher using reed relays so it switches between audio and ICOM when ever Squelch opens and I Transmit. Ive looked at the manual and see that the ACC socket Pin 1 is Regulated +8v, Pin 3 is HSEND and Pin 7 is VSEND (Both Ground when transmits) and Pin 13 is Squelch output (Also grounded when Squelch opens). Im in the UK so my local shop has some Reed Relays that have a coil current of 10ma +-10%. Would this be the way others would go with this setup as im not a electronics engineer so don't really want to get in to transistors if I can help it. All im mainly concerned about is the IC-7000 supplying enough current to drive the coil's in the relays. Hope someone can help. M6CMB

[m0bov]

I use my 7000 ACC socket to power my TalkSafe BT unit, if that helps but there's no fuse on that socket so if you pop it then bye bye rig!

[5B4AJB]

It wouldn't hurt to put a diode on each output pin if you're going to common transmit and receive together with relays.

Try measuring the current at 8V on the relays, use a resistor to keep the current down to 10-15mA. (I think it works out at around 700 Ohm)

Fuses are nice too! check your manual for the absolute current limit, 100mA should be big enough and fairly easy to find...

[W1zardsleeve]

Thanks for the reply's. What I was planning on doing was running three reeds one for each of the outputs then using them to switch some some larger audio grade switching relays (Takahashi) to switch the audio. Didn't even occur to run diodes on the outputs so I could run just one relay. Thanks for the tip. Oh ill get some fuses while im there. Might have ago at this today if I get time to get down MAPLIN. Lee

[W1zardsleeve]

Thanks for the reply's. Ive got all the bits together to build this today and just had a thought. Should I be worried about the back EMF from the reed relays. Shall I put diodes across the coils on them. Thanks Lee