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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] |
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A homemade replacement for the Yaesu FTS-8 subtone encoder - Using
just a PIC and an active filter! [Manfred Mornhinweg] |
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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] |
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FodTrack - My world-famous realtime satellite tracking system!
[Manfred Mornhinweg] |
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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] |
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-/+-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] |
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1 Transistor FM Receiver - (circuit / schematic design added 6/06)
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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)
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2 Transistor 2 LED Flasher - Schematic only, there is no circuit
description…. [Tony van Roon's circuit] |
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2 transistor amplifier - Schematic only, no circuit description |
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2 Transistor Atomic Frequency Standard - (circuit / schematic design added
6/06) |
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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] |
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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] |
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2 Transistor FM Transmitters (Bill Bowden) - .... |
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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] |
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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….... |
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2 Transistor Transmitter (Rob van der Weijden) - A compact 2 transistor
transmitter for use at VHF frequencies…..(schematic / Circuit design added 8/08)
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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] |
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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] |
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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] |
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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) |
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202: Transistor Outline - National Semiconductor Application Note (app
note added 2/06) |
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226: Transistor Outline - National Semiconductor Application Note (app
note added 2/06) |
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237: Transistor Outline - National Semiconductor Application Note....[App
Note] |
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25 Watt MosFet Audio Amplifier - High Quality simple unit. No need for a
Preamplifier.... |
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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) |
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2-Step Power Conversion: Portable Power for the Future - Design Solutions 8
Design Notes (Linear Technology)....[App Note] |
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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) |
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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)
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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) |
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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…. |
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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) |
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3 Transistor FM Radio Bug - Electroinic circuit…. [from Harry Lythall's
website] |
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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] |
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300W MOSFET Linear Amplifier for 50 MHz - Application Note Microsemi-formerly
Advanced Power Technology APT9802 ( app note added 05/07) |
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4 Transistor Tracking Transmitter - Schematic and parts list only, no
circuit description included…. [Tony van Roon's circuit] |
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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] |
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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) |
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50 Mhz, 250w Amplifier Using Push-Pull Arf448a/B - Application Note
Microsemi formerly Advanced Power APT9702A (added 05/07) |
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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) |
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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) |
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7 Watt Amplifier - A 2 Watt audio amplifier made from discrete components.
Low distortion Amplifier using discrete components… [Design by Andy Collison] |
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