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Amplifier Circuits:  Intermediate Frequency (IF) 
Amplifier -- Main Page         
Last Updated on: Thursday, April 07, 2016 12:59 PM

Circuits Designed by Dave Johnson, P.E. :
  • 100Khz Low Power Light Receiver  -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . [Hobby Circuit designed by Dave Johnson P.E.,  04/17/05]

  • 10Mhz to 20Mhz Light Receiver  -  Light power to volts conversion = APPROX. 15mV per microwatt at 850nM . . . [Circuit by David Johnson P.E.,  07/11/06]

  • 175Khz Inductive Pulse Receiver  -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough Amplification for the signal to be easily viewed on an oscilloscope . . . [Circuit by Dave Johnson P.E.,  06/30/00]

  • 1Khz to Over 70Mhz Light Receiver  -  This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver with a very fast response. It is designed around a PIN photo diode that is packaged for use with plastic optical fibers. It can be used as an optical fiber receiver. By using the open end of the optical fiber it can "sniff" out any modulated light signals . . . [Hobby Circuit designed by David Johnson P.E.,  06/11/00]

  • 1us LED Pulse Driver + Voltage to Frequency Converter  -  This circuit receives the signal from the above amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/22/99]

  • 2Mhz Broad Band Optical Fiber Receiver  -  If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector . . . [Hobby Circuit designed by David A. Johnson P.E.,  06/09/00]

  • 2uS Light Pulse Receiver  -  Although the LF357 is an obsolete part, this circuit gives you an idea how to build a sensitive modulated light detector with high ambient light immunity.  The first section uses a 100mH inductor as an efficient photodiode current to voltage conversion circuit . . . [Circuit by David A. Johnson P.E.,  06/03/02]

  • 30Khz Light Receiver Amp  -  This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . [Circuit by Dave Johnson P.E.,  03/07/02]

  • 40Khz Light Receiver Amp  -  This circuit is similar to 30KHZ LIGHT RECEIVER AMP  but provides more gain and operates up to 40KHz. However it draws more power supply current. . . . [Circuit by David Johnson P.E.,  03/07/02]

  • 40Khz Ultrasound Receiver  -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Circuit by David Johnson P.E.,  01/29/06]

  • 5Mhz Broad Band  Optical Fiber Receiver  -  This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated . . . [Circuit by David A. Johnson P.E.,  06/04/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

100Khz Low Power Light Receiver -  By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . [Hobby Circuit designed by Dave Johnson P.E.,  04/17/05]

 

10Mhz to 20Mhz Light Receiver -  Light power to volts conversion = APPROX. 15mV per microwatt at 850nM . . . [Circuit by David Johnson P.E.,  07/11/06]

 

175Khz Inductive Pulse Receiver -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough Amplification for the signal to be easily viewed on an oscilloscope . . . [Circuit by Dave Johnson P.E.,  06/30/00]

1Khz to Over 70Mhz Light Receiver -  This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver with a very fast response. It is designed around a PIN photo diode that is packaged for use with plastic optical fibers. It can be used as an optical fiber receiver. By using the open end of the optical fiber it can "sniff" out any modulated light signals . . . [Hobby Circuit designed by David Johnson P.E.,  06/11/00]

 

1us LED Pulse Driver + Voltage to Frequency Converter -  This circuit receives the signal from the above Amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/22/99]

 

2Mhz Broad Band Optical Fiber Receiver -  If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector . . . [Hobby Circuit designed by David A. Johnson P.E.,  06/09/00]

 

2uS Light Pulse Receiver -  Although the LF357 is an obsolete part, this circuit gives you an idea how to build a sensitive modulated light detector with high ambient light immunity.  The first section uses a 100mH inductor as an efficient photodiode current to voltage conversion circuit . . . [Circuit by David A. Johnson P.E.,  06/03/02]

 

30Khz Light Receiver Amp -  This circuit uses NPN darlington transistor to Amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . [Circuit by Dave Johnson P.E.,  03/07/02]

 

40Khz Light Receiver Amp -  This circuit is similar to 30KHZ LIGHT RECEIVER AMP  but provides more gain and operates up to 40KHz. However it draws more power supply current. . . . [Circuit by David Johnson P.E.,  03/07/02]

 

40Khz Ultrasound Receiver -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Circuit by David Johnson P.E.,  01/29/06]

 

5Mhz Broad Band  Optical Fiber Receiver -  This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to over 5MHz.  It is great for experimenting with various modulated . . . [Circuit by David A. Johnson P.E.,  06/04/00]


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Intermediate Frequency (IF) 


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