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Transistor Circuits, Page 1
Transistors:  #'s    A     B-C     D-G     H-I     J - O     P - S     T - Z
Last Updated on: Tuesday, April 01, 2014 04:30 AM

Circuits Designed by Dave Johnson, P.E. :

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

40 meter SSB QRP transceiver -  In 1987 I built this radio. It has been published in a national ham radio magazine, and now finally found its way into the web! [Manfred Mornhinweg]
A homemade replacement for the Yaesu FTS-8 subtone encoder -  Using just a PIC and an active filter! [Manfred Mornhinweg]
An automatically tuned HF mobile antenna -  This elegant design covers the complete spectrum from 7 to 30 MHz at less than 1.3:1 SWR, is compact, very weatherproof, robust and has good performance.  This article was first published in the QEX / Communication Quarterly magazine...[Manfred Mornhinweg]
FodTrack -  My world-famous realtime satellite tracking system! [Manfred Mornhinweg]
SWR meter for 1 to 1300 MHz -  A very simple design, cheap to built, does not require adjustment and works well! Depending on specific components and construction technique used, the upper frequency limit will be somewhere between 150MHz and 5GHz! [Manfred Mornhinweg]
-/+-0.1V Differential Amplifier Circuit using Zero Threshold EPAD MOSFETs  -  This circuit presents a differential amplifier using Zero Threshold EPAD MOSFETs that oooooperates on 1/- 0.1v supplies.  The schematic diagram is for a single amplifier stage…Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]

1 Transistor FM Receiver -  (circuit / schematic design added 6/06)
1-transistor FM Transmitter -  A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulates  signal and acts as an oscillator. L1 and C5 determine  frequency. Decrease C5 for a higher frequency and vice-versa. You won't get a long range transmission with this one....(added 6/06)
2 Transistor 2 LED Flasher -  Schematic only, there is no circuit description…. [Tony van Roon's circuit]
2 transistor amplifier -  Schematic only, no circuit description
2 Transistor Atomic Frequency Standard -  (circuit / schematic design added 6/06)
2 transistor circuit replaces IC -  7-Feb-02 Issue of EDN  Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card.  This task is difficult because the IC must work bidirectionally, meaning that you can simultaneously and actively drive both sides. However, as is sometimes the case, you can replace a complicated circuit by a simple one without much loss of performance.... [Design Idea by Jim Hagerman, Hagerman Technology, Honolulu, HI]
2 Transistor Circuit replaces IC (Hagtech) -  I am always impressed with the way semiconductor manufacturers go out of their way to make the end designer’s job easier. One example is the LTC4300 recently introduced by Linear Technology…. [Jim Haggerman, Hagerman Technology LLC]
2 Transistor FM Transmitters (Bill Bowden) -  ....
2 Transistor LED Flasher -  This is a classic 2 transistor astable multivibrator. Many other NPN small signal or switching transistors can be used, including 2N4401, PN2222 or 2N2222 using the circuit on the left. The circuit can also be inverted using PNP transistors…. [from Bill's Electronics Reference Library]
2 Transistor LED Flasher (Bill Bowden) -  This circuit will flash a bright LED (500 mcd) as an attention getting device or fack car alarm.  Component values are not cirtical and other transistors may be…....
2 Transistor Transmitter (Rob van der Weijden) -  A compact 2 transistor transmitter for use at VHF frequencies…..(schematic / Circuit design added 8/08)
2 Transistors Form Bidirectional Level Translator -  11/07/96 EDN-Design IdeasThis example illustrates a translation from 5 to 3V, but it can accommodate almost any other voltage levels, provided the logic-low levels are equal (usually0V]. Translations from 1 to 100V are possible, albeit rather slow. The key to this circuit is the unusual cross-coupling of the emitters.... [Design Idea by Jim Hagerman, Nokia Mobile Phones, San Diego, CA]
2 Transistors Form Bidirectional Level Translator -  You often need to convert a logic signal from one power supply voltage to another.  This conversion is a relatively simple task, unless the signal happens to be bi-directional. Serial buses such as Access.bus, I2C, and SBI use bi-directional data lines. Some buses may require translating logic from one voltage to another; for example....[Jim Hagerman, Nokia Mobile Phones, San Diego, CA] [Jim Haggerman, Hagerman Technology LLC]
2 transistors form high precision, ac mains ZCD -  7-Jun-07 Issue of EDN  A simple two-transistor circuit can accurately detect the zero crossing of the ac mains voltage.... [Design Idea by Djessas Zoheir, Constantine, Algeria]
2 Watt Amplifier -  This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman, Mini-Disc, iPod and CD players, computers and similar devices fitted with line or headphone output. Of course, in most cases you will have to make two boxes to obtain stereo....(circuit / schematic design added 6/06)
202: Transistor Outline -  National Semiconductor Application Note  (app note added 2/06)
226: Transistor Outline -  National Semiconductor Application Note  (app note added 2/06)
237: Transistor Outline -  National Semiconductor Application Note....[App Note]
25 Watt MosFet Audio Amplifier -  High Quality simple unit. No need for a Preamplifier....
2N2222 40 Meter CW/DSB Tranceiver -  In spring of 1998, NorCal sponsored a contest to design and build a project using no ICs and 22 or fewer 2N2222s as the active semiconductor devices. I thought this was a really intriguing idea, so I set about to design my version....(circuit / schematic design added 6/06)
2-Step Power Conversion: Portable Power for the Future -  Design Solutions 8  Design Notes (Linear Technology)....[App Note]
2-Transistor Amplifier -  A simple two-stage Amplifier. Use any general-purpose NPN with high gain. It will drive low impedance headphones directly. A speaker will probably require furr boost.  (added 6/06)
2-transistor FM Transmitter -  While re are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over  little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio,....(added 6/06)
2W Amplifier -   Amplifier operates in Class AB mode;  single 470R preset resistor controls  quiescent current flowing through  BD139/140 complimentary output transistors. Adjustment here, is a trade-off between low distortion and low quiescent current. Typically,....(added 6/06)
3 Transistor Amplifier -  This electronic circuit design shows a simple two transistor amplifier with feedback. It offers a reasonably high impedance while providing a low output impedance….
3 Transistor Audio Amp 50 Milliwatt -  Here is a little audio amplifier similar to what you might find in a small transistor radio. (added 6/06)
3 Transistor FM Radio Bug -  Electroinic circuit…. [from Harry Lythall's website]
300v Peak To Peak Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times.... [Designed by David A. Johnson]
300W MOSFET Linear Amplifier for 50 MHz -  Application Note Microsemi-formerly Advanced Power Technology APT9802  ( app note added 05/07)
4 Transistor Tracking Transmitter -  Schematic and parts list only, no circuit description included…. [Tony van Roon's circuit]
4 Transistor Transmitter -  This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor.... [Design by Paul K Sherby]
4-transistor H-bridge -  an interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i.e., no combination of inputs can cause  bridge to self-destruct).  (added 6/06)
50 Mhz, 250w Amplifier Using Push-Pull Arf448a/B -  Application Note Microsemi formerly Advanced Power APT9702A (added 05/07)
500W, Class E 27.12 MHz Amplifier Using A Single Plastic MOSFET -  Application Note Microsemi-formerly Advanced Power Technology APT9903  ( app note added 05/07)
6-transistor H-bridge -  This is  six transistor "Tilden style" H-bridge; while not as old as  original "basic H-bridge," this goes "way back," and is  basis for many BEAM driver circuits (added 6/06)
7 Watt Amplifier -  A 2 Watt audio amplifier made from discrete components. Low distortion Amplifier using discrete components… [Design by Andy Collison]

Transistors:  #'s    A     B-C     D-G     H-I     J - O     P - S     T - Z


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