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Amplifier Circuits:  Power Circuits
Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

Amplifier -- Main Page

Last Updated: October 13, 2017 03:02 AM

Circuits Designed by Dave Johnson, P.E. :

Laser Light Detyector-10Mhz to 20Mhz   -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Hobby Circuit designed by Dave Johnson P.E.-June 14, 2000

Light Receiver-10MHz to 20MHz   -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by David A. Johnson P.E.-July 11, 2006

 

 

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

Large Area Photodiode Bootstrapping -  Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger.  This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies.  The addition of a low noise JFET __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Laser Light Detyector-10Mhz to 20Mhz -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Latching Relay Bypass  -  Latching Relay Bypass Circuit __ Designed by Guitar Effect RC Keen

LED Musicolour: Light Up Your Music, Pt.1 -  Now you can have a kaleidoscope of colour which continually changes in time to music.  This consists of 16 strings of LEDs which are individually controlled by 16 frequency bands.  Louder signals in each of those bands means that the respective LED string will be brighter.  Use it for a Christmas light show, a disco or just for fun when playing music. __ SiliconChip

LED Musicolour: Light Up Your Music, Pt.2 -  The new LED Musicolour makes building a spectacular light and music show easier than ever.  In this second and final instalment, we explain how to build and test the unit and also detail how you can control it. __ SiliconChip

LF Block Converter -  This converter shifts the VLF/LF bands, from below 20 kHz to over 350 kHz to the shortwave frequencies, determined by the selected crystal.  In this prototype, the crystal frequency is 5 MHz, so the LF band comes out at 5.02 MHZ to 5.35 MHz, suitable for use with a shortwave receiver.  Notice the lack of an expensive mixer or special IC! __ Contact: Charles Wenzel of Wenzel Associates, Inc.

LF dB Output meter -  Ham RadioOther __ Designed by Guy Roels ON6MU

LF to HF Converter -  This converter allows reception of signals below 500 kHz on a 3.5 4 MHz HF receiver.    It should therefore be useful for those with receivers that do not receive the lower frequencies.  amateur radio construction projects. __ Designed by Peter Parker

Light Alarm with LDR -  This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3.6 V battery or 3 x 1.2 volts rechargeable batteries.  The well-known UM66 is used as the sound generator and will give a pleasent wake up alarm.  As you probably know the LDR is a light dependent resistor.  Normally the resistance of an LDR is __ Designed by Popescu Marian

Light Receiver-10MHz to 20MHz -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Lil' Tiger AO-43 Organ to Guitar Amp Conversion -  with reverb, pitch-shifting vibrato and tremolo __ Designed by G. Forrest Cook

Liquidator Tube Phaser/Chorus Effect -  This project involves the conversion of a Hammond AO-47 organ vibrato unit into a 4 phase guitar/music phaser/chorus box.  The individual phase signals can be mixed for a wide variety of sounds.  The Liquidator name comes from the liquidy sounds that the device creates, it wiggles the audio all around.  Used Hammond vibrato units can often be purchased for little money on eBay and provide the majority of the circuitry for this device.  The Hammond AO-41 box can also be used for this project, it has a similar phaser circuit and one extra 7 pin tube socket.  Here is the Original Hammond AO-47 Schematic for reference. __ Designed by G. Forrest Cook

Little Guitar Amp -  I built this little guitar amp for my brother, Rich, a while back.  Originally it was sort of a Fender "Champ" copy with a 12AX7 front end.  I recently converted it to use a single EF86 pentode, instead.  I like it much better this way.  The amp chassis fits into a small maple open-back box with a single 10" speaker.  Rich built the box __ Designed by Bob Danielak

LM3886 Minimus Power-Power Audio Amplifier 70 Watts RMS-Compact Version -  Circuit compact audio power amplifier using integrated circuit National Semiconductors LM6886TF, PCB compact, making it ideal for use where you need a compact amplifier with high power and high quality audio.  Ideal for use in various applications such as, computer games, Mp3 Player, Home Theater, Surround sound, etc.  About the amplifier circuit with LM3886 Minimus [] __ Designed by Antonio Rodrigues

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier -  A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low Noise, Low Power Photodiode Amplifier -  Low Noise, Low Power Photodiode Amplifier is Better than Monolithics.  Low Bias Current, Low Current Noise and Unity Gain Stability Keep the Circuit Operational from 0ohm to several Gohm.  Amplifier input noise density and gain-bandwidth product were measured to be 2.4nV/rtHz and 100MHz, respectively, with only 3.8mA supply __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Low pass filter for subwoofer -  The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies.  In the low frequencies is degraded the sense of direction.  This reason us leads to the utilization speaker for the attribution of very low frequencies.  The manufacture that to you we propose distinguishes these frequencies, in order to him we lead to the corresponding amplifier.  The acoustic filters are met in various points in the sound systems. 

Low pass filter-subwoofer filter -  The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies.  In the low frequencies is degraded the sense of direction.  This reason us leads to the utilization speaker for the attribution of very low frequencies.  The manufacture that to you we propose distinguishes these frequencies, in order to him we lead to the corresponding amplifier.  The acoustic filters are met in various points in the sound systems. __ Designed by Steve Filianos

Low Power Single-Ended 6SN7 Amp -  I built this little amp for my computer at work.  It sounds pretty darn good thru some old speakers from an Emerson tube console.  At <1/2 Watt it is STILL too loud for my office. __ Designed by Bob Danielak

Low Power Single-Ended 6SN7 Amp power supply This is the power supply for the 6SN7 Amp __ Designed by Bob Danielak

LTC6945 Wideband Point-to-Point Radio Local Oscillator -  The LTC6945 is a high performance, low noise, 6GHz phase locked loop (PLL) , including a reference divider, phase frequency detector (PFD) with phase-lock indicator, charge pump, integer feedback divider and VCO output divider.  The part features a buffered, programmable VCO output divider with a range of 1 through 6.  The differential, __ Linear Technology/Analog Devices App Note, Jan 16th 2012

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Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

 


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