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12th November 2008, 03:16 PM
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#1 |
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diyAudio Member
Join Date: Nov 2008
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Driving 8 Ohm Speaker
Hello,
I think I am in the right section to post this question. Well here goes. I am trying to build a dynamic Mic amplifier to drive a 8 ohm speaker but the speaker doesn't give any output. I am using a single transistor as a pre-amp. circuit 1 see attachment Then I feed the output of the above circuit into a push-pull configuration with more or less unity voltage gain but Supposedly gives current gain. circuit 2 see attachment looking with oscilloscope on circuit above (Push_pull) I get about 4vP-P(c2). When I then plug in 8 Ohm speaker at( C2 to GND) the output signal vanishes!! Anybody know why?? |
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12th November 2008, 06:09 PM
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#3 |
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diyAudio Member
Join Date: Nov 2008
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Driving 8 Ohm speaker help required
Hello,
I think I am in the right section to post this question. Well here goes. I am trying to build a dynamic Mic amplifier to drive a 8 ohm speaker but the speaker doesn't give any output. I am using a single transistor as a pre-amp. circuit 1 see attachment Then I feed the output of the above circuit into a push-pull configuration with more or less unity voltage gain but Supposedly gives current gain. circuit 2 see attachment looking with oscilloscope on circuit above (Push_pull) I get about 4vP-P(c2). When I then plug in 8 Ohm speaker at( C2 to GND) the output signal vanishes!! Anybody know why?? 
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12th November 2008, 06:09 PM
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#4 |
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diyAudio Member
Join Date: Nov 2008
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Right you are will copy over to solid state.
Cheers |
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12th November 2008, 07:04 PM
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#5 |
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diyAudio Member
Join Date: Dec 2007
Location: Vermont
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It appears that your attachments are playing hide and seek, and currently it is hiding. Some may be seeking, but have not found.
 Peace, Dave |
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12th November 2008, 07:24 PM
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#6 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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Re: Driving 8 Ohm speaker help required
When input feed from one (dynamic) microphone for 8 Ohm speaker out ...
1. we need a lot of voltage gain even for a low level out, we may need amplify x100 2. we need a power supply giving at least at least like 25 mA 3. we need the output stage having high enough input impedance not to reduce the voltage amplifier gain too much
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lineup |
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12th November 2008, 07:29 PM
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#7 |
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diyAudio Member
Join Date: Nov 2007
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If you wanted chipamp, howabout nte1516 (NEC UPC1212C) Op Amp? That's a "soft clip" chip, and if you get the mic too hott or too close, the output is rounded a bit. That's pretty sweet for stopping some customary problems with microphones.
 The device will drive an 8 ohm speaker. Options are driving the speaker with BTL config or using the device to drive line level.
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12th November 2008, 08:41 PM
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#8 |
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Speakerholic
diyAudio Moderator
Join Date: Jan 2004
Location: British Columbia
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Two threads have been merged.
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12th November 2008, 09:08 PM
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#9 |
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diyAudio Member
Join Date: Nov 2008
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Thanks guys
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