Simple voltage amp?

jman 31 · 6th March 2009, 01:43 PM

I need to take about .2 dc volts and increase it to about 5 volts. Is there a simple circuit to achieve this? The voltage is supplied when a piezo transducer is struck and the amp can not produce any voltage when it is not being struck. I googled it, but I ended up more confused than when I started. THIS looks promising, but it starts with a voltage of .7.

Please let me know if you have any ideas on this.
Thanks
Jeremy

theAnonymous1 · 6th March 2009, 01:55 PM

Waaaaaaaaa?

Do you need a DC/DC converter or an amplifier? They are two different things.

An amplifier is a powered device that can take your 0.2V and amplify it to 5V.

A DC/DC converter would (in theory) take the 0.2V and boost it to 5V. That's not going to happen though.

analog_sa · 6th March 2009, 01:58 PM

Jeremy

It will be better if you describe exactly what you want to achieve. Is it really a dc amplifier or are you amplifiying the signal from the piezo transducer? Or is it just a circuit which switches between two output voltages?

jman 31 · 6th March 2009, 02:02 PM

HERE is what I am trying to achieve. I don't know exactly what I need. I didn't get any responses on this so I decided to try a different idea. If you can make head or tails of what I am trying to accomplish and can help me, I could sure use it!

Thanks

pacificblue · 6th March 2009, 05:38 PM

You could use an op amp as amplifier, e. g. like here on page 2, figure 2. R1 = 270 Ohm, R2 = 6,8 kOhm could give you the gain you want.

jman 31 · 6th March 2009, 08:08 PM

Thanks guys. I have come pretty close to what I'm after using this circuit here. I just have to figure out now how to make the LED flash much brighter.

analog_sa · 6th March 2009, 08:28 PM

Doesn't seem like it will work with R3. Actually most of the parts in your circuit, athough fine by themselves, don't make too much sense together. Once you fix your circuit a bit a darlington may provide the missing brighness.

jman 31 · 6th March 2009, 08:36 PM

Quote:

Originally posted by analog_sa
Doesn't seem like it will work with R3. Actually most of the parts in your circuit, athough fine by themselves, don't make too much sense together. Once you fix your circuit a bit a darlington may provide the missing brighness.

Can you give me some tips on how to improve it? It actually does work pretty well, like I said except for the brightness, but I would like to learn about what I am doing instead of just using bits of different circuits I find and piecing them together. Should I get rid of R3?

Thanks
Jman

analog_sa · 6th March 2009, 09:37 PM

If it works very well then your circuit is wrong as it shows the led getting current through a 1M resistor.

jman 31 · 7th March 2009, 02:02 AM

I'm sure you are right, can you expound on what you are getting at. Obviously I don't know what I am doing or I wouldn't be having problems with a circuit that only has five parts. So rather than making comments about what I'm doing wrong, please help me make a circuit that will work. I don't mean to be rude, but if I had the answers I wouldn't be asking you to help.

If you don't want to help, I understand, but It doesn't do me any good for you to make comments that make no sense to an average guy like me trying to get an understanding of what I am doing.

I really mean no offense, but I just don't have the knowledge that it takes to understand your reasoning.

Jman

6th March 2009, 01:43 PM	#1
jman 31 diyAudio Member Join Date: Oct 2008 Location: Florida	Simple voltage amp? I need to take about .2 dc volts and increase it to about 5 volts. Is there a simple circuit to achieve this? The voltage is supplied when a piezo transducer is struck and the amp can not produce any voltage when it is not being struck. I googled it, but I ended up more confused than when I started. THIS looks promising, but it starts with a voltage of .7. Please let me know if you have any ideas on this. Thanks Jeremy

6th March 2009, 01:55 PM	#2
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Waaaaaaaaa? Do you need a DC/DC converter or an amplifier? They are two different things. An amplifier is a powered device that can take your 0.2V and amplify it to 5V. A DC/DC converter would (in theory) take the 0.2V and boost it to 5V. That's not going to happen though. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

6th March 2009, 05:38 PM	#5
pacificblue diyAudio Member Join Date: May 2008	You could use an op amp as amplifier, e. g. like here on page 2, figure 2. R1 = 270 Ohm, R2 = 6,8 kOhm could give you the gain you want. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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6th March 2009, 01:58 PM	#3
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Jeremy It will be better if you describe exactly what you want to achieve. Is it really a dc amplifier or are you amplifiying the signal from the piezo transducer? Or is it just a circuit which switches between two output voltages?

6th March 2009, 02:02 PM	#4
jman 31 diyAudio Member Join Date: Oct 2008 Location: Florida	HERE is what I am trying to achieve. I don't know exactly what I need. I didn't get any responses on this so I decided to try a different idea. If you can make head or tails of what I am trying to accomplish and can help me, I could sure use it! Thanks

6th March 2009, 08:28 PM	#7
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Doesn't seem like it will work with R3. Actually most of the parts in your circuit, athough fine by themselves, don't make too much sense together. Once you fix your circuit a bit a darlington may provide the missing brighness.

6th March 2009, 09:37 PM	#9
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	If it works very well then your circuit is wrong as it shows the led getting current through a 1M resistor.

7th March 2009, 02:02 AM	#10
jman 31 diyAudio Member Join Date: Oct 2008 Location: Florida	I'm sure you are right, can you expound on what you are getting at. Obviously I don't know what I am doing or I wouldn't be having problems with a circuit that only has five parts. So rather than making comments about what I'm doing wrong, please help me make a circuit that will work. I don't mean to be rude, but if I had the answers I wouldn't be asking you to help. If you don't want to help, I understand, but It doesn't do me any good for you to make comments that make no sense to an average guy like me trying to get an understanding of what I am doing. I really mean no offense, but I just don't have the knowledge that it takes to understand your reasoning. Jman

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