ISD voice recorders - Electronic Circuits Projects Diagrams Free

Shohadawy · 9th July 2009, 09:54 AM

I'm going to use one of the ISD single chip recorders to record and playback some messages. I intend to use a PLC to order the device to playback.

The problem is that:

1- I have more than a speaker in different places.Can I connect them all to one chip PCB?

2- If I want to playback more different messages can I use a single device? I'm going to use the ISD 1400 chip

ericgibbs · 9th July 2009, 10:09 AM

Quote:

Originally Posted by Shohadawy

I'm going to use one of the ISD single chip recorders to record and playback some messages. I intend to use a PLC to order the device to playback.

The problem is that:

1- I have more than a speaker in different places.Can I connect them all to one chip PCB?

2- If I want to playback more different messages can I use a single device? I'm going to use the ISD 1400 chip

hi,
The ISD1400 datasheet states, fully addressable multiple messages.

Its designed to drive a 16 ohm speaker.
I would suggest an intermediate audio amp for multiple speakers.

Hero999 · 9th July 2009, 09:23 PM

Agreed, you need a separate amplifier, you might be able to get away with four 64Ω speakers but it wouldn't be very loud.

What sort of speakers are these?

Power rating? Impedance?

How many of them do you have?

If you don't want to bother building more than one amplifier you could use an amplifier designed for a 4Ω load and use 64Ω speakers. This will enable you to drive up to 16 connected in parallel. This idea is only good for small speakers, if you want a PA then you'll need a 100V system.

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9th July 2009, 09:54 AM	#1
Shohadawy	ISD voice recorders I'm going to use one of the ISD single chip recorders to record and playback some messages. I intend to use a PLC to order the device to playback. The problem is that: 1- I have more than a speaker in different places.Can I connect them all to one chip PCB? 2- If I want to playback more different messages can I use a single device? I'm going to use the ISD 1400 chip

9th July 2009, 09:23 PM	#3
Hero999	Agreed, you need a separate amplifier, you might be able to get away with four 64Ω speakers but it wouldn't be very loud. What sort of speakers are these? Power rating? Impedance? How many of them do you have? If you don't want to bother building more than one amplifier you could use an amplifier designed for a 4Ω load and use 64Ω speakers. This will enable you to drive up to 16 connected in parallel. This idea is only good for small speakers, if you want a PA then you'll need a 100V system. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.