midibox can drive relay (no "ic")

[wavewalker]

hello

i seen that midibox drive "cv"  devices

my question is :

midibox can drive "discrete" relay (no "ic")

???

[lylehaze]

Depends on the relay, and which chip is driving it.

Most PIC outputs can sink or source about 20 to 25 ma.

That is not much current to work with.

The 74HC595 chips used in the DOUT modules must stay below 35ma per pin, 70ma per chip.

Other driver chips may be available, I'll let you look them up.

If it's an electromagnetic relay, you also have to protect the output from the voltage spike that you'll get when the output turns OFF.

Many relays have an optocoupled input (LED). These are a much better choice for driving from an output.

Have Fun,

LyleHaze

[lucem]

When using a transistor driver stage, you can drive relays with DOUT pins.

[Janis1279]

From the DOUT Module additional info section :

http://www.ucapps.de/mbhp/mbhp_doutx1_reed_relays.pdf

[wavewalker]

Depends on the relay, and which chip is driving it.

Most PIC outputs can sink or source about 20 to 25 ma.

That is not much current to work with.

The 74HC595 chips used in the DOUT modules must stay below 35ma per pin, 70ma per chip.

Other driver chips may be available, I'll let you look them up.

If it's an electromagnetic relay, you also have to protect the output from the voltage spike that you'll get when the output turns OFF.

Many relays have an optocoupled input (LED). These are a much better choice for driving from an output.

Hello and thanks to all for reply posted

what I would want to understand is if i can make a device

with midibox , for control a little audio matrix for my hi-fi setup,

a box with 8 stereo in + 4 stereo out , for select with a remote control (processed by pic)

different audio device input like cd player,turmtable,computer out,cassette,old revox b77,blu ray, etc..

and send the "source" to my hi-fi amplifier  ,

and for a clean audio signal , i cannot use IC but "discrete" relay as in-out "doors" ,

i seen the skeme for dout where midibox can drive ic-relay ,

but is the same circuit for drive a "discrete" relay?

thank so much to averybody give an help about

kind regards

ww

[lylehaze]

I see..

There are many examples of using a PIC to receive remote control signals, but I have not seen any here with the MidiBox. Most of what we do here is controlled by Midi.

One of my "open projects" is a IR remote receiver that sends MIDI messages, but it's not yet ready.

There is a discussion of a MIDI controlled audio switcher, but I don't think it's done yet.

http://www.midibox.org/forum/index.php/topic,11262.0.html

Except the DOCMatrix, which does appear complete... there's a picture of it in there somewhere.

Well, that's a starting point, anyway.

Have Fun,

LyleHaze

[wavewalker]

There is a discussion of a MIDI controlled audio switcher, but I don't think it's done yet.

http://www.midibox.org/forum/index.php/topic,11262.0.html

thanks for post

i seen that project last week

is an "ic" way audio "matrix"

ww