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Thanks for the replies.

Dave, I hooked up the red line to the relay's common line but no success.

I'm spinning my wheels here and wondering if I should try a different approach. I've been...

I finally have some time to get back to this...

I rebuilt the circuit in a cleaner way so that all the grounds are tied to one rail on the prototyping board, and that seems to have stopped the...

Thanks, Ioannis.

I have a bench-top DC power supply (EZ Digital Co), grounded, not switching. Current is sufficient to switch relays as far as I can tell. All relays have protection diodes...

After doing some research I learned that I need bypass capacitors in my circuit: one across the PIC's Vss and Vdd pins, and one across the coil of each relay. I added 0.1 uF caps in these locations...

Hey BobK, thanks a lot for the updated schematic. I understand the sequence you've described and the schematic now.

I constructed your updated circuit (minus the "dial" relay) and tested a little...

I had to figure out how to interface a small SPDT relay (Radio Shack, PN 275-240) to my PIC, and was able to do a little test and turn on an LED, so I have that working. Now it's just a simple...

Thanks for the schematic, BobK! I'll play around with it later, I won't be able to work on this for a few days.

Thanks for the response, BobK. I appreciate your assistance.

I do have a few solid state relays but I'm not sure if they'll work in this application. I think I have some schematics for hooking...

Woo hoo!

I got it working. I had incorrectly wired one leg of the transformer. I dialed out to a couple of phone numbers successfully. I used the default 4 MHz oscillator.

I'm a bit of a...

Greetings!

I'm working on a personal project that involves interfacing a PIC micro to the telephone and dialing out a specific phone number using DTMF tones generated by the PIC. I am using a...

I got it running again after I checked the serial connection with a simple program. Got the bootloader working again, and it all seems OK now. I have no idea why it wasn't working previously.

I...

Thank you for your reply, Henrik.

I was able to successfully load my program using the U2 programmer and the circuit works correctly, so it's definitely not the programmer, as you suggested.

I...

Greetings! Newbie here.

I am using a 16F876A with the ME Labs U2 programmer and MCS+ v 3.0.0.5. It's slow going but I'm learning. I managed to successfully load the bootloader, establish...