Now showing circuits 41-56 of 56. Sort by

Geophone Amplifier

Geophone Amplifier PUBLIC

Single-supply voltage. High-impedance differential input referenced to ground. Low impedance differential line-driver output. This circuit would not converge with old JFET model. CircuitLab fixed the...

by anubi | updated May 19, 2012

amplifier   audio   bjt   differential   jfet   level-shift   startup  


Trouble2 PUBLIC

This is a subset of "Trouble 1". This is the core voltage gain and DC bias feedback which would exhibit convergence difficulty on the old FET model. CircuitLab has fixed the model. This circuit now...

by anubi | updated May 18, 2012

amplifier   bjt   convergence   feedback   initial-conditions   jfet   level-shift   startup  

bjt and relay

bjt and relay PUBLIC

by foofoo | updated April 26, 2012

bjt   relay  

Capacitively Loaded Emitter Follower

Capacitively Loaded Emitter Follower PUBLIC

An emitter follower is supposed to have its output voltage follow changes in its input approximately 1 to 1, but fast input edges and a capacitively loaded output lead to undesired and asymmetric...

by CircuitLab | updated April 13, 2012

bjt   emitter-follower   time-constant  

BJT PWM -- multi-stage rise/fall times

BJT PWM -- multi-stage rise/fall times PUBLIC

Power BJTs can be used to switch lots of current, but they require lots of base current as well.

by mrobbins | updated March 28, 2012

bjt   power   pwm  

XOR BJT Circuit


This is a way I have constructed an XOR TTL Logic Gate using NPN BJT transistors.

by digitalcircuitman777 | updated March 27, 2012

bjt   digital   digitalcircuitman777   logic-gate   transistor   ttl   xor  

Inverter BJT Circuit

Inverter BJT Circuit PUBLIC

This is how I constructed an Inverter TTL Logic Gate using an NPN BJT transistor.

by digitalcircuitman777 | updated March 26, 2012

bjt   digital   digitalcircuitman777   inverter   logic-gate   transistor   ttl  

BJT Amplifier Common Emitter

BJT Amplifier Common Emitter PUBLIC

by ab-irato | updated March 15, 2012

amplifier   bjt  

DX Amp


This is a simple 50 watt audio power amplifier circuit that was designed by Brazilian Carlos Mergulhão who offers it freely to the DIY community -- for non commercial use. It has since become renowned...

by TAJ | updated March 13, 2012

amplifier   audio   bjt  

TL431-like shunt voltage regulator

TL431-like shunt voltage regulator PUBLIC

BJT, op-amp, and internal reference voltage source make a model of a shunt voltage regulator

by mrobbins | updated March 06, 2012

bjt   op-amp   voltage-regulator  

555 motor controller

555 motor controller PUBLIC

555 oscillator easy motor control. not so stable. very effective.

by danielfiction | updated March 02, 2012

555   555-motor-controller   astable   bjt   cheap   dfiction   econo   flyback-diode   motor   pwm  

Copy of danielfiction's 555 motor controller ($0.50!)

Copy of danielfiction's 555 motor controller ($0.50!) PUBLIC

Build a PWM motor controller for $0.50! Based on danielfiction's circuit (link inside).

by mrobbins | updated March 01, 2012

555   bjt   motor   pwm  

BJT difference amp

BJT difference amp PUBLIC

by mrobbins | updated February 04, 2012

amplifier   bjt  

BJT saturation characteristic tester

BJT saturation characteristic tester PUBLIC

by mrobbins | updated November 13, 2011

bjt   saturation  

BJT f_T measurement

BJT f_T measurement PUBLIC

by mrobbins | updated November 11, 2011

bjt   frequency-domain   high-speed   rf  

Cascode current mirror -- actively loaded differential pair amp

Cascode current mirror -- actively loaded differential pair amp PUBLIC

Q1 and Q2 are the main amplification. The four PNP BJTs provide a cascoded current mirror for super high gain active load.

by mrobbins | updated November 01, 2011

amplifier   bjt   cascode  

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