Download Voltage to Current Converter (non Inverting) (step 1)

GROUP : 5
 Korat Hardeep
(130510109033)
 Kotadia Smith
(130510109034)
 Makvana Chirag
(130510109036)
 Kunjadiya Abhishek (130510109035)
 Makwana Nikhil
(130510109037)
 Chauhan Maulik
(130510109038)
Guided by :
Proff. DHARMESH GEHLOT
VOLTAGE TO CURRENT CONVERTERS
 Voltage to Current Converter with Floating Load.
 Low Voltage AC Voltmeter.
 Voltage to Current Converter with Grounded
Load.
Voltage to Current Converter with
Floating Load.
Fig.-voltage to current converter with floating load
 The load( ) is called as floating load because it is not connected to
ground.
 In this the input voltage is applied to the non-inverting terminal of OPAMP. Load resistance is connected in place of the feedback resistor( )
 This circuit is also called current series negative feedback amplifier.
This is because of the feedback voltage across is proportional to
output current & appear in series with the input voltage.
 Apply KVL to the input loop of circuit,
 Assume that the op-amp is an ideal one. Hence
this value into upper equation ,
. Substituting
 But
…(as
)
 Sensitivity of this circuit is 1/
.
 Hence sensitivity can be increased by decreasing the value
of R1.
 Voltage To Current Converters is used in application such
as low voltage AC voltmeters, LED and zener diode testers
etc.
Low Voltage AC Voltmeter
• In this finger a combination of bridge rectifier and
ammeter is connected in place of of V to I converter.
• The rectifier converts ac current to dc current. Thus
the unidirectional dc current flows through the
ammeter. Hence the ammeter measures the average
value of the rectified current.
Voltage to Current Converter with
Grounded Load
Fig.-Voltage-to-current converter (Transconductance amplifier).
Voltage to Current Converter (Inverting)
Fig.-Voltage-to-current converter with grounded load.
Voltage to Current Converter (Non Inverting)
Fig.- Voltage-to-current converter with grounded load.
Voltage to Current Converter (non Inverting)
(step 1)
Voltage to Current converter (step 2)
LED Tester
 We can use this this circuit as LED tester by putting
the switch into position-3.
 The LED test current i.e. is set by setting the values
of
and .
 We can test different LEDs for their brightness fir the
same test current .