Category Archives: News

To know more about the 20 Watt Channel Stereo Power FM transmitter Amplifier

Circuit Description:

There are many instances where a simple and reliable power amplifier is needed – rear and centre channel speakers for surround-sound, beefing up the PC speakers, low powered tweeter amplifier, etc. For those who want to build their own ‘Gainclone’ amplifier, this will certainl More →

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FSN-30l 30W 1U Professional FM Exciter and Broadcast Radio transmitter 87.5-108 MHz cover 5KM-8KM

FSN-30l 30W 1U Professional FM Exciter and Broadcast Radio transmitter 87.5-108 MHz cover 5KM-8KM

FSN-30l 30W 1U Professional FM Exciter and Broadcast Radio Transmitter 87.5-108 MHz cover 5KM-8KM More →

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The review of the 15W transmitter come from the users

The review of the 15W transmitter come from the users More →

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VHF-DD Horizontal polarization High-power Four-dipole TV Antenna,Frequency range 6~12CH

VHF-DD Horizontal polarization High-power Four-dipole TV Antenna,Frequency range 6~12CH More →

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The half-wave dipole matching connect analysis

The half-wave dipole matching connect analysis

Picture 1 cable is connected with the half-wave dipole half-wave oscillator AB two points of view into the input impedance of 73Ω, two oscillator has symmetry, so A, B two points on the ground impedance 73 / 2 = 36.5Ω.

Image 1 75Ω cable length of AC More →

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matters should pay attention when Using Zener diode

matters should pay attention when Using Zener diode

The Zener diode versatile. Looks very simple, but if you do not pay attention, but also easily damaged.

Only Zener diodes in series may be used, but due to the discrete nature of the diode parameters are relatively large, can not be used in parallel.

Temperature a greater impact on the characteristics of semiconductor devices, when the ambient temperature exceeds 50 ° C, the temperature is increased by 1 ℃, the maximum power dissipation should be reduced by 1%.

Zener diode pin must be in at more than 5mm away from the shell and tube welding, it is best to use a soldering iron 30W less power. 40 ~ 75W soldering iron welding, soldering time should not exceed 8 ~ 10s.Try to use the built-in solder, solder wire welding, do not use a large piece of tin.

Zener diode voltage temperature coefficient compensation Zener diode silicon diode (including silicon zener diodes) can be used in tandem, the forward diode string of not more than three, with a special temperature compensation tube in series to use.

In order to obtain lower stable voltage, can select the appropriate Zener diode connected in series in the opposite polarity direction, coupled with the proper working current. Upcoming regulator diode forward.

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Three interesting radio

Three interesting radio

Three interesting radio More →

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The importance of FM transmitter receiver radio in disaster relief

The importance of FM transmitter receiver radio in disaster relief

The importance of FM transmitter receiver radio in disaster relief More →

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Yagi five unit FM antenna production–How to DIY a FM Yagi antenna

Yagi five unit FM antenna production--How to DIY a FM Yagi antenna

Yagi five unit FM antenna production–How to DIY a FM Yagi antenna
1. The antenna matching problem: general antenna output for 300 ohms, and cable for 75 ohms. Impedance matching different will receive, or high frequency signal is difficult to transmission. More →

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Kenwood intercom TK208 intercom maintenance case (1)

Kenwood intercom TK208 intercom maintenance case (1)

Kenwood intercom maintenance case More →

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