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yerima

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Everything posted by yerima

  1. Hi guys I am a new member from nigeria. First of all my regards to all that have contributed to this forum to become one of the best learning centre in the world, so much has been archieved by people who have no knowledge about electronic circuit, how the components function etc. This is due to the healthy debates and selfless services from people like Audioguru,CDAK etc. I was able to build the electronic stethoscope 2 which worked very well. I use a very cheap 32 ohms empedance head phone to listen to my heart beat clearly, the only problem is that it is not very loud. I then added a 10uf capacitor b/w pin 1 and 8 of the power amplifier (lm 386) which increased the gain from 20 to 200, i can now listen to my heat beat clearly with the lungs auscultation. the ony problem i have is it picks up outside conversations and cell phones ringing, any body with an idea how it can be eliminated. also how can it be adopted to serve both as a noise detector in circuits and as an electronic stethoscope. Finally what is the input voltage to the pre-amp, how is it determine (calculated), what is the input/out put voltage to and from the power amp how is it calculated. It would be of tremendous help to me , as a final year project for the award of post HND in elect./telecomms. Thanks Aminu yerima.
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