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FM Transmitter 2 Transistor 2008-11-21 00:16:00 A major improvement over the little FM transmitter 1-transistor circuit that we've discussed previously, this transmitter consist of two stages. The first transistor is used to amplify audio, which means that the microphone is now much more sensitive to sound. The second one acts as an oscillator.
All in all, this is an interesting project for beginners and more experienced hobbyists alike. Use Read more:Transmitter
FM Transmitter 1 Transistor 2008-11-21 00:06:00 This is a truly minimalist circuit of FM Transmitter
. Performance is relatively poor and stability is a problem. Q1 modulates the signal and acts as an oscillator. L1 and C5 determine the frequency. Decrease C5 for a higher frequency and vice-versa. It's suitable for beginners for their first fm transmitter project.
With one FM transmitter you won't get a long range transmission with this one.
Tiny 2-Zone Alarm 2008-11-20 23:48:00 This a really small alarm that could easily fit inside a pocket. However, I also demanded reliable operation, simple construction and very low power consumption. I started with CMOS logic gates, but was soon forced to abandon the concept after a few unsuccessful (and far too complicated) takes.
As you can clearly see from the schematics, the circuit is utterly primitive and consists of two ident Read more:Zone Alarm
Regulated Power Supply 78xx 2008-11-20 23:38:00 Here's an universal circuit of all the voltage regulator ICs, the 78xx family is by far the most established. Not surprisingly! It's difficult to get performance this good with so few outside components necessary.
The 78xx family just like the famous LM317, incorporates automatic shutdown in case of overheating. You can get up to 1.5A of current with a suitable heat sink. No fuse is required.
&n Read more:Supply
100 MHz Ground Plane FM Antenna 2008-11-20 23:29:00 Here's a simple fm antenna plan you can find. This simple ground plane antenna works well in the FM Band 88-108 MHz. It's built of a small plastic disk (around 5cm in diameter, not critical) and stiff copper wire (preferably enamel coated) some 3mm thick. It's omnidirectional, therefore it works equally well in all directions. This makes it suitable for most applications.
100 MHz Ground Pla Read more:Antenna
, Plane
Variable Power Supply 1-25V LM317 2008-11-20 23:18:00 This is a variable power supply circuit uses LM317. LM317 is a versatile and highly efficient 1.2-37V voltage regulator that can provide up to 1.5A of current with a large heat sink. It's ideal for just about any application. Since LM317 is protected against short-circuit, no fuse is necessary.
Although LM317 regulated IC is capable of delivering up to 37V, the circuit pictured here is limited to Read more:Supply
, Variable
Metal Detector 2008-11-20 23:01:00 The main idea of metal detector is really quite simple: build two identical oscillators and adjust them to the same frequency. One of the oscillators uses the search coil while the second one incorporates a variable inductor. When both are operating at the same frequency, the output is zero. If the search coil moves near any metal, however, frequency of the first oscillator shifts and an audible t Read more:Detector
, Metal
FM Transmitter 4W 2008-11-20 22:45:00 This FM transmitter circuit is fairly small and operates in the FM band 88-108 MHz. The last two transistors dissipate quite a lot of heat. Make sure to protect them with sufficiently large heatsinks or else you'll have a nasty meltdown. All off the coils are not all that critical, but should still be winded carefully to ensure efficient operation. Use enamel-coated wire at least 1mm thick. As wit Read more:Transmitter
Linear Power Supply 13.8V 20A 2008-11-20 13:38:00 This linear power supplycircuit has a transformer that steps down the line voltage to some voltage that is higher than what will be required at the regulated output. Then a rectifier and a filter capacitor transform the low voltage AC into a moderately filtered DC that still is unregulated and has some ripple. Finally, a regulating circuit "burns off" the excess voltage, leaving only the exact am Read more:Linear
, Supply
Switching Power Supply 13.8V 40A 2008-11-20 13:09:00 This power supply circuit produces 13.8V regulated to better than 1%, at a continuous load current of up to 40A. It has current limiting, making it appropriate for direct connection to a 12V backup battery. If the current limit potentiometer is turned up, the power supply can deliver up to 60A on an intermittent basis, while maintaining regulation. No minimum load is required. The ripple on the ou Read more:Supply
, Switching
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for eDesignCircuits
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At eDesignCircuits, the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by eDesignCircuits and how it is used.
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, Privacy Policy
24 VDC Power Supply with maximum Current 5A 2008-12-03 00:52:00 Here's a 24 VDC power supply circuit with voltage input 20-30 Vcc. This power supply produces voltage output 13.5 VDC maximum current 5A.
The features capability of this 24 VDC power supply are protection against short circuit current, over temperature, over output voltage, and inversion polarity.
See 24 VDC Power Supply
schematic below.
Parts list of the 24 VDC Power Supply
C1 = 3 Read more:Current
Simple Rain Detector 2008-11-26 19:08:00 Here's a simple rain detector circuit. It uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.
Rain Sensor and Alarm
The sensor made of a small piece of PC board etched to the pattern showen in the schematic. The traces should be ver Read more:Detector
, Simple
Coil Coupled Metal Detector 2008-11-24 20:06:00 Another metal detector circuit where coils overlap to produce tone. Position out of phase on search head. It is based on a standard transformer coupled oscillator (TCO) - hence the name Coil Coupled Operation (CCO) MetalDetector
. Although requiring a BFO (in this case provided by a Medium Wave radio), it differs from a typical BFO detector in that its performance far outstrips that of BFO.
The
Beat Balance Metal Detector 2008-11-24 19:47:00 Here's a metal detector circuit that frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce an audible heterodyne. On the surface of it, this design would seem to represent little more than a twinned BFO metal detector.
What makes the metal detector different above all else (check a simple metal detector), and significantly increases its range, is that each coil m Read more:Balance
, Detector
, Metal
Circular Polarized FM Broadcast Antenna 88-108 MHz 2008-11-23 03:53:00 Here's the diagram of Circular
polarized FM antenna for FM broadcast band 88-108 MHz. If you want to stack the antenna use jumper cable as you can see at the diagram.
See more about FM antenna stacking. Welcome to experiment
FM Antenna
Diagram in detail Read more:Broadcast
Miniature FM Transmitter 2008-11-23 03:38:00 This simple circuit allows you to transmit audio signals over an area of about 100 meters radio. The signal emitted by this FM transmitter can be tuned anywhere in the Dial your FM radio, because their frequency of transmission can be easily located between the 88 and 108MHz.
Its uses of the fm transmitter are unlimited, can be used as a monitor for babies, such as wireless microphone for confer Read more:Transmitter
A Simple Digital RF Power Meter 2008-11-22 07:31:00 This electronic circuit is a simple digital power meter. It is designed to operate as an inline power meter and displays the results on a 16 digit LCD display. It measures, in one range, power from 100 nW to 100W ( 9 orders of magnitude ) covering all HF bands up to 2 metres. It is usable with correction to 70 cms.
The meter comprises two separate parts, an RF unit and a display unit. The interfa Read more:Digital
, Meter
, Simple
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