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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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Thread Tools | Display Modes |
21st February 2005, 06:40 AM
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New Member
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HT9170 - DTMF receiver
Hello I am currently making a project in which enables me to turn applications on and off whilst I am not at home. I decided to get the HT9170B from Rapid and use in conjunction with a programmable chip to read the outputs but I am having several problems. I used the datasheet found at this URL http://www.rapidelectronics.co.uk/im...g/82-4078e.pdf. And used application circuit 2 with the suggested value resistors/capacitors. However I got no output on any of the pins when using a mulitmeter. I am fairly new to electronics so no doubt I have done something wrong. Any help would be much appreciated,
Jack |
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21st February 2005, 08:42 AM
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Experienced Member
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Re: HT9170 - DTMF receiver
The OE (pin10) of the IC is said to be internally pull high on P.3 of the above datasheet. But I sense something not quite right in the description because it mentioned clearly pulled down but no mention of pull HIGH.
Try connecting a 60K to 150K resistor from this pin to Vcc and measure the response again. Hope this help.
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L.Chung |
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Linear Mode
