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2 transistor FM transmitter / FM bug - VOYAGER is a super-sensitive FM Radio microphone developed by Talking Electronics. The components are all common types of resistors, capacitors and transistors matched so well in this circuit that amazing sensitivity and distance are obtained. The name VOYAGER was given to it "because it goes so far". We have re-designed the Board and further matched some components to suit the needs of the classroom. The result is a superb bug which is compact but powerful, and quite easy to build__ CdS Electronic
2 Transistor LED Flasher - This 1.5 volt LED fasher runs more than a year on a single 'd" cell and alternately flashes 2 LEDs at about a 1 second rate. The circuit employs a 74HC14 CMOS
hex inverter that will operate at very low voltages (less than 1 volt). One section is used as a squarewave oscillator (pins 1 and 2) , while the others are wired to produce a short 10mS pulse on alternate edges of the square wave so the LEDs will alternate back and forth. The output sections each use a capacitor charge pump to increase the voltage for the LEDs __ Designed by Bill Bowden
2 Transistor LED Flasher - This circuit will flash a bright red LED as an attention getting device or fake care alarm. __ Designed by 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. __ Designed by Bill's Electronics Reference Library
2 Transistor LED Flasher 1 - Circuit Only __ Designed by Tony van Roon VA3AVR
2 Transistor LED Flasher 2 - This circuit will flash a super-bright LED (5000+ mcd). Good for fake car alarm or other attention getting device. Component values are not critical, try anything else first from your junkbox. Obviously, the 470 ohm resistor (R3) determines the LEDs brightness and limits the current flow to about 20mA.390 ohm can also be used as a save value. if you decide to go with a green or yellow led, which draw more current, you may want to replace the 470 ohm with an appropriate value. Flash rate is determined by R2 and C1 __ Designed by Tony van Roon VA3AVR
2 transistor lights LEDs - 04/09/09 EDN Design Ideas: A previous Design ideas - describes a circuit that uses an astable multivibrator to drive an LED (Reference 1]. The circuit in Figure 1 uses a simpler alternative approach. The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP trans Design by Barry A Tigner, Michigan State University, East Lansing, MI
2 transistor replaces IC - 02/07/02 EDN Design Ideas: 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 side as. However, as is sometimes the case, you can replace a complicated circuit by a simple one without much loss of performance Design by Jim Hagerman, Hagerman Technology, Honolulu, HI
2 Transistor 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. __ Designed by Jim Haggerman, Hagerman Technology LLC
2 Transistor Transmitter - A compact 2 transistor transmitter for use at VHF frequencies. __ Designed by Rob van der Weijden
2 transistors form bidirectional level translator - 11/07/96 EDN Design Ideas: This 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 by Jim Hagerman, Nokia Mobile Phones, San Diego, CA
2 transistors form high-precision, ac-mains ZCD - 7-Jun-07 EDN Design Ideas: A simple two-transistor circuit can accurately detect the zero crossing of the ac mains voltage Design by Djessas Zoheir, Constantine, Algeria
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 __ Designed by Monty Northrup
2-Step Power Conversion: Portable Power for the Future - Design Solutions 8 Design Notes__ Linear Technology/Analog Devices
2-Transistor Amplifier - it has been interesting analyzing these radios. You have to give the Japanese credit for even making a radio that can drive a speaker with only 2 transistors! Basically, the first transistor (Q1) performs double-duty. it first acts as an RF amplifier, with some of the signal being fed back to the antenna coil to provide some regeneration for better selectivity and sensitivity __ Designed by schematic and circuit description were provided Ronald Rissel
2-Transistor FM Transmitter - While there are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over the little 1-transistor circuit that we've discussed previously this transmitter__ tomzi.geo page
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. __
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. . . Circuit by David Johnson P.E.-June, 2000
3-transistor current source covers wide range - 05/31/14 EDN Design Ideas: This Design idea is a two-wire current regulator that strikes a good balance between performance and parts count. Employing three transistors, three resistors, and one LED, it achieves good regulation (better than 1% over most of the voltage range) , lower operating voltage (1.2V typical) , and better tempco (0.07%/K) than other circuits of similar complexity. it is designed to operate in a range of currents from tens of milliamperes to several amps. it does not use any hard to find parts; for example: an LM10 can be used to make an even higher performance circuit, but this IC is not multi-sourced and is likely to be discontinued. Design by Einar Abell0
4 Small Transistor Alarm Circuits - Battery-Powered Alarm Circuits: This is a selection of simple self-contained transistor based alarm circuits - complete with photographs. They are designed around the Complementary Latch. All may be triggered by both normally-open and normally-closed switches. They have a very low standby current - and are ideal for battery operation. __ Designed by Ron J.
4 Transistor Tracking Transmitter - Schematic and parts list only, no circuit description included. __ Designed by Tony van Roon VA3AVR
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 colpits stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor __ Designed by Paul K Sherby
40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier - For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used. This is a high gain (Av=1001) example with excellent low offset voltage and drift with temperature __ Linear Technology/Analog Devices App Note, Mar 16th 2010
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 the bridge to self-destruct). __ Designed by Steve Bolt
4W FM Transmitter - This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 Watts and works off 12-18 VDC which makes it easily portable. it is the ideal project for the beginner __ Designed by © smart kit electronics
6-transistor H-bridge - This issix transistor "Tilden style" H-bridge; while not as old asoriginal "basic H-bridge, " this goes "way back, " and is basis for many BEAM driver circuits __ Contact Bruce Robinson |
