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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Limiter Circuits

40KHz Limiting Amp  -  This circuit has a gain of X20 at 40KHz.  The Amplifier output level is limited to 2.5v peak to peak. Limiting action begins with a 50v peak to peak input . . . [Circuit by David A. Johnson P.E.,  07/09/06]


High Temperature Thermocouple activates Relay  -  Voltage from a high temperature thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


Incandescent Lamp Inrush Current Limiter  -  This circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 Amp, but it could be scaled to any desired current . . . [Circuit by Dave Johnson P.E.,  07/09/06]


Inrush Current Limiter for a n Incandescent Lamp   -  This circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 Amp, but it could be scaled to any desired current . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/09/06]

Limiting Amplifier-40Khz  -  This circuit has a gain of X20 at 40KHz.  The amplifier output level is limited to 2.5v peak to peak. Limiting action begins with a 50v peak to peak input . . . [Hobby Circuit designed by David Johnson P.E.,  07/09/06]


Supercapacitor Voltage Limiting Circuit  -  Supercapacitors are working their way into more and more applications where electrical energy needs to be stored.  These robust devices can be charged and discharged 1000s of times and will typically outlast a battery . . . [Circuit by David Johnson P.E.,  03/27/10]


Thermocouple Temperature Activates Relay  -  Voltage from a high temperature thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F . . . [Circuit by Dave Johnson P.E.,  07/09/06]


Ultrasound Receiver-40Khz  -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/29/06]


Voltage Limiting sith a Supercapacitor  -  Supercapacitors are working their way into more and more applications where electrical energy needs to be stored.  These robust devices can be charged and discharged 1000s of times and will typically outlast a battery . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/27/10]

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