Simple Transistor Tester with mA meter as Indicator

This Transistor circuit Tester use for testing whether your transistor it still in good condition or not. This circuit of transistor tester using mA meter as an Indicator.

This Transistor Tester use for check whether the transistor tested in good condition or not. If the transistor tested still in good condition, mA meter pin will move , if the transistor tested not in good condition mA meter will not move or steady.
Switch S1 and S2, is sliding switch for setting whether the transistor tested is NPN or PNP.

S3 is sliding switch for set capacity power of mA, in this circuit we use 1 mA meter.
S4 is Push On Switch for giving voltage current to tested transistor.

When we want to tested NPN Transistor, Switch S1 and S2 we connect to Q2 and Q4, and press Push On Switch S4 to test the transistor . If the transistor in Good condition, the pin of mA meter will move to on a number of measurement. If the transistor in not works well , the pin of mA meter will not move .

WSPR Radio Receiver Kit for 20 Meter Amateur Band Model RK-20

• Have fun receiving WSPR signals from around the world.
• Electronic Kit - Soldering and Assembly Required.
• Kit is for Intermediate to Advanced builders - not for beginners.
• Needs PC, USB port, sound card and free WSPR software to operate.
• User supplied antenna is required. No enclosure supplied.

Want some fun receiving specially coded WSPR radio signals from around the world. This receiver may be what you need. A PC with USB port and sound-card is needed. To operate you must install free software (search the web for WSPR software and articles). User supplies antenna wire and ground to operate. Power is taken from USB. The "weak signal propagation reporter" software or WSPR is designed to communicate with low power by Amateur Radio operators. Only 20M WSPR signals may be received with this unit. Photo shows all items in kit. Partially assembled kits may not be returned.
For WSPR software, you can download here for free use.

World Band Radio Antenna

• *The AN-LP1 is not recommended for use with Sony models ICF-SW10, ICF-SW11, ICF-SW77.
• *The AN-LP1 derives power from the radio when connected to Sony models ICF-SW1000T and ICF-SW7600G.

The Sony AN-LP1 portable active antenna is just right for travelers who wants maximum performance from their world band radio. The flexible folding loop antenna is 19 inches (48 cm) when open, but folds down with a twist to a mere 7 inches (18 cm) and neatly fits in the supplied soft carrying case. A mounting clip and suction cup on the end of the loop allows easy placement in a variety of situations. The suction cup is especially useful for mounting the antenna to a window where reception will often be the best. A reselection knob selects operation from 3.85-21.95 MHz. The AN-LP1 requires two AA cells for about 40 hours of use. The supplied cable connecting the loop to the ANl-LP1 control box is 12 feet long. The supplied cable connecting the control box to the radio is 8 inches long. Output is to a 3.5 mm mini plug. Comes with an English, French, German and Japanese instructions from Sony. Item is made in Japan.

25 mW Digital FM Transmitter Kit

• PLL synthesized for drift free operation
• Front panel digital control and display of all settings and parameters
• Professional metal case for noise-free operation
• EMI filtering on audio and power inputs
• Electronic Kit, Assembly Required
  
  
  
   
  
• THE LEGACY CONTINUES! For nearly a decade we have been the leader in hobbyist FM radio transmitters. First we came out with our low cost FM10, the tunable FM transmitter that has set records as the most popular school, scouting, and first time hobbyist kit. Then we introduced the world famous FM25 series of FM transmitters. We took the basic concept of the tunable FM10, made it synthesized for rock solid and stable operation and gave it the features and performance that made it THE LEADER in low cost FM stereo transmitters. From there we introduced our FM100 series Super Pro FM Stereo Radio Station. We took the exceptional circuitry of the FM25 and built a stand-alone "radio station" around it, complete with microphone and line level audio mixers, digital control and display of operating frequency, higher RF power output options, and put it all in a professional case. To date, the FM100 series continue to be our #1 selling products! How could we make history better? We listened to thousands of our customers that loved the stability of the PLL synthesized FM25 series but wanted easy to change front panel control of the operating frequency and wanted to know what frequency they were transmitting on. They also wanted the capability of controlling the audio levels at the transmitter rather than changing the input levels. We thought those were very legitimate requests, and our response was to move up to the FM100 series. "But I don't need an audio mixer, I don't need all that fancy stuff built-in, I just need a small transmitter I can afford"! Here you go, designed from the ground up...the FM30 series! The FM30 is designed using through-hole technology and components and is available only as a do-it-yourself kit, with a 25mW output very similar to our FM25 series.

AM FM Radio Kit, Good for Educational

This Kit AM FM Radio, good for educational purposed for building AM FM Radio and for knowing more AM FM radio receiver . 

This Kit come with books as a guide for study more about the AM FM circuit, start from Audio Amplifier, AM Detector, AM IF, AM Amplifier, AM Mixer & Oscillator, FM Detector, 1st FM IF, 2nd FM IF, and FM RF Stages. Superheterodyne receiver of standard AM and FM broadcast frequencies.

 

• AM/FM Radio Kit (Combo IC & Transistor)
• Includes 64 page educational training guide
• with multiple choice questions and answers
• Training course of 56 pages is divided into 9 lessons: Audio Amplifier, AM Detector, AM IF, AM Amplifier, AM Mixer & Oscillator, FM Detector, 1st FM IF, 2nd FM IF, and FM RF Stages. Superheterodyne receiver of standard AM and FM broadcast frequencies. Makes an excellent classroom project. Requires 9V battery, not included.