Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library

Free library / Schemes of radio-electronic and electrical devices

Telecontrol transmitter. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Radio control equipment

Comments on the article Comments on the article

The figure shows a schematic diagram of a transmitter for remote control of models. The simultaneous use of both npn and pnp structure transistors, as well as a unijunction transistor, made it possible to obtain a fairly simple device with good performance characteristics.

The radio frequency path of the transmitter is made on transistors T1 and T2. The frequency of the master oscillator on the transistor T1 is stabilized by a Pe1 quartz resonator (27,12 MHz). The connection with the final stage is inductive. The final stage transistor T2 operates in class C (without pre-bias on the base). The load of the terminal stage is an n-loop, which makes it easy to select the optimal operating modes of the stage and communication with the antenna.

Remote control transmitter

A low-frequency generator is made on a unijunction transistor T5. The required generation frequency is set by trimming resistors R9-R11. Frequency selection is carried out by switches B1-B3. The supply voltage of the unijunction transistor is stabilized.

Through the buffer stage on the transistor T4, a low-frequency signal is fed to the modulator. Transistor T3 of the modulator is connected in series in direct current with the transistor of the output stage and allows for almost one hundred percent modulation.

Coil L1 is wound with a wire with a diameter of 0,4 mm on a polystyrene frame with a diameter of 6 mm. (The core is made of carbonyl iron. The coupling coil L2 has 2,5 turns. The L3 coil contains 12 turns of wire with a diameter of 1 mm. The winding is frameless, the diameter is 12 mm. The inductor Dr1 is wound on a polystyrene frame with a diameter of 4 mm and has 60 turns of wire with a diameter of 0,12, XNUMX mm.

The transmitter can use P403 (P), KT606 (T2), GT402, GT403 (T3), KT315A (T4), KT117 (TS) transistors, D9 (D1) series diodes and D809 (D2) zener diode.


  1. "Tehnium" (Romania), 1976, No. 2

Publication: N. Bolshakov,

See other articles Section Radio control equipment.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Improving the efficiency of PbS quantum dot solar cells 14.06.2024

The latest solar technology research represents a significant breakthrough in improving the efficiency of PbS quantum dot solar cells. This method, based on the use of pulsed light, offers promise for simplifying the production and expanding the applications of these cells. A research team from the Daegu Gyeongbuk Institute of Science and Technology has developed an innovative method that uses pulsed light to improve the electrical conductivity of PbS solar cells. This method can significantly reduce the processing time required to achieve similar results. PbS quantum dot solar cells have significant potential in solar technology due to their photovoltaic properties. However, the formation of defects on their surface can reduce their performance. The new method helps suppress defect formation and improve electrical conductivity. Using strong light to complete the process ... >>

Magnetic Power Bank 5000mAh 14.06.2024

Huawei introduces a convenient and multifunctional charger to the market - Huawei SuperCharge All-in-One Magnetic Power Bank. This magnetic battery allows you to quickly and conveniently charge your Huawei phone anywhere, anytime. With a thickness of just 11,26 mm and a weight of 141 grams, this portable power bank fits easily into a pocket or bag, making it ideal for travel and everyday use. Despite its compact size, this battery provides enough power to charge your phone on the go. The new product supports wired charging with a power of 25 W and wireless charging up to 15 W (and up to 30 W when connected to an adapter), providing fast charging for both the power bank itself and other devices. The battery is compatible with various fast charging protocols such as SCP, UFCS and PD, making it ideal for a wide range of devices. The power bank is also compatible with Huawei phones that support wireless charging. ... >>

Changes in a father's brain after the birth of a child 13.06.2024

A recent study conducted by scientists from the Hefei Institute of Physical Sciences of the Chinese Academy of Sciences found interesting changes in the brains of men after becoming fathers. These changes were associated with involvement in child care, sleep problems, and mental health symptoms. Scientists found that men who became fathers experienced a loss of brain volume after giving birth. This volume loss was associated with greater involvement in parenting, sleep problems, and mental health symptoms. Researchers have found significant changes in men's brains between the prenatal and postnatal periods. In particular, there was a loss of gray matter volume, especially in parts of the brain responsible for higher functions such as language, memory, problem solving and decision making. Men who paid more attention to their children and spent more time with them lost more gray matter in their brains. This also affected their mental health ... >>

Random news from the Archive

Netgear Nighthawk AC1900 (R7000) 1900 Mbps Router 02.10.2013

Networking specialist Netgear has unveiled its Nighthawk AC802.11 (R1900) dual-band 7000ac wireless router. The device is built on a dual-core processor operating at a frequency of 1 GHz and is equipped with a USB 3.0 port. In addition, it supports Netgear Beamforming+ technology, which, according to the manufacturer, allows for significant connection speed and stability, providing maximum coverage.

Compliant with 802.11a/b/g/n and 802.11ac specifications, the R7000 achieves a total speed of 1900 Mbps (600 + 1300 Mbps). The router configuration includes three external antennas for wireless connection and five Gigabit Ethernet ports (one WAN and four LAN) for fast wired connection.

It should be noted the advanced Quality of Service functions for outgoing traffic, which optimize settings for online games. Nighthawk automatically assigns Xbox traffic a high priority, so the load from other devices will not slow down the gameplay, which is critical for even millisecond delays.

The presence of a USB 3.0 port makes it possible to organize high-speed shared access to an external drive. In particular, this feature can be used to broadcast video to DLNA-enabled TVs throughout the home or for automatic centralized data backup. Your device supports Apple Time Machine backup technology.

With dimensions of 285 x 184,5 x 50 mm, the device weighs 750 g.

Other interesting news:

▪ Bose-Einstein condensate drives a phonon laser

▪ Dangers of Early Antibiotic Use

▪ PK2 Pocket Digital Strobe Light

▪ One photon is split into three entangled individual photons

▪ Found enzyme will solve the problem of biofuel

News feed of science and technology, new electronics


Interesting materials of the Free Technical Library:

▪ site section Measuring equipment. Article selection

▪ article How to make a home video so that it would be interesting to watch later. video art

▪ article What rule, derived by Leonardo, obeys the trunk and branches of trees? Detailed answer

▪ article Development of a list of works with increased danger

▪ article Oscillator with a frequency response indicator on the LCD. Encyclopedia of radio electronics and electrical engineering

▪ article Nokia 8910 pinout. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:


Email (optional):

A comment:

All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews