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Topic Title: Do I need a Load Resistor? Topic Summary: I have a detector feeding into an amplifier circuit and need to know if I should use a load resistor? Created On: 12 July 2012 03:50 PM Status: Post and Reply |
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 12 July 2012 03:50 PM
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Hi all,
I don't fully understand the purpose of load resistors and could do with some advice... I have a detector (which contains and amplifier) which has an output load resistance of 50KOhm. This feeds into a potential divider of R1 = 1M and R2 = 33K, and then into a series of op amps. Do I need to include a 47KOhm load resistor (connected to ground) before the potential divider? If so, why? Thanks for your help. SF |
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12 July 2012 04:25 PM
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" ...a detector (which contains and amplifier) which has an output load resistance of 50KOhm."
From what you say it is not clear of your amplifier has a 50k output resistance or requires a minimum load resistance of 50k in order to operate correctly. Can you point us to a datasheet for it? In the meanwhile you might like to have a play with a simple model of the former possibility here: https://www.circuitlab.com/circuit/29gq27/sensor-amp-01/ 
------------------------- Andy Fierman --------------------------- http://signality.co.uk --------------------------- |
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20 November 2012 02:55 PM
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What could be the case is that your amplifier needs a minimum load resistance of 50kOhm. in that case you would need to include the load resistor.
Edited: 20 November 2012 at 03:04 PM by Claudfox |
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16 April 2013 11:54 PM
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You have not supplied the necessary info:?
(a) Are you working with semiconductors or valves? (b) Does the input to your following amplifier require a voltage feed or a current feed? (c) the total effective value of the load resistor determines the bandwidth of the driving tuned circuit d) are you aware that, in a current circuit, a potential divider must be replaced by a current-divider? This is why the volume controls of most "trannies" do not work properly. Feed-in at the tapping point and out across the entire divider. I kid you not. ken Green |
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Do I need a Load Resistor?
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