Integrated circuits STK021, STKO24, STK031 and STK035 from Sanyo are made in SIP10 packages with 10 pins and are hybrid low-frequency power amplifiers with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
Integrated circuits STK030, STK058, STK075, STK077, STK078, STK080, STK082, STK083, STK084 and STK086 from Sanyo are made in 10-pin SIP10 packages and are hybrid low-frequency power amplifiers with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment with bipolar power. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
Integrated circuits STK050 and STK070 from Sanyo are made in SIP 10 packages with 16 pins and are hybrid low-frequency power amplifiers with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment with bipolar power. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
Sanyo integrated circuits STK075G, STK077G, STK078G, STK080G, STK082G, STK084G, STK085, STK086G are made in SIP 10 packages with 10 pins and are hybrid low-frequency power amplifiers with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment with bipolar power. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
Integrated circuits STK0292, STK0352 and STK0452 from Sanyo are made in SIP10 packages with 10 pins and are output modules of low-frequency power amplifiers in a hybrid design with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment with bipolar power. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
The listed Sanyo microcircuits are made in SIP10 packages with 16 pins and are two-channel low-frequency power amplifiers in a hybrid design with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of the microcircuits (output parameters for one channel) are as follows:
The listed Sanyo microcircuits are made in SIP10 packages with 16 pins and are two-channel (stereo) low-frequency power amplifiers in a hybrid design with identical circuits (pinouts) and different parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of the microcircuits (output parameters for one channel) are as follows:
Integrated circuits STK1030, STK1040, STK1050, STK1050II, STK1060, STK1060II, STK1070, STK1070II, STK1080II and STK1100II from Sanyo are made in 10-pin SIP10 packages and are output modules of low-frequency power amplifiers in hybrid design with identical circuits (pinouts) and various parameters. Designed for use in tape recorders, electrophones, television and radio receivers, and other high-end audio equipment with bipolar power. The microcircuits do not have output protection against a short circuit in the load. To obtain maximum output power, the microcircuit must be installed on a heat sink (radiator). Some of the main parameters of microcircuits are as follows:
The stereo volume, balance and tone control on the ТСА5550 has the following parameters: Low harmonic distortion no more than 0.1% Supply voltage 10-16V (12V nominal) Current consumption 15 ... 30mA Input voltage 0.5V (gain at a supply voltage of 12V unit) Tone control range -14…+14dB Balance adjustment range 3dB Difference between channels 45dB Signal to noise ratio …
The schematic diagram of the transmitter is shown in Fig.1. The transmitter (27MHz) delivers about 0.5W of power. A wire 1 m long is used as an antenna. The transmitter consists of 3 stages - master oscillator (VT1), power amplifier (VT2) and manipulator (VT3). The frequency of the master oscillator is given by sq. resonator Q1 at a frequency of 27 MHz. The generator is loaded on the circuit ...
Amplifier parameters: Total range of reproducible frequencies 12 ... 20000Hz Maximum output power of MF-HF channels (Rн=2.7Ω, Up=14V) 2*12W Maximum output power of LF channel (Rн=4Ω, Up=14V) 24W RF channels with SOI 0.2% 2 * 8W Rated power of the low-frequency channel with SOI 0.2% 14W Maximum current consumption 8 A In this circuit, A1 is an RF-MF amplifier, and ...
The VHF receiver operates in the range of 64-108 MHz. The receiver circuit is based on 2 microcircuits: K174XA34 and VA5386, in addition there are 17 capacitors and only 2 resistors in the circuit. The oscillatory circuit is one, heterodyne. On A1, a superheterodyne VHF-FM was performed without ULF. The signal from the antenna is fed through C1 to the input of the IF chip A1 (output 12). The station is tuned in...
Today I would like to tell you about an amplifier which, in my opinion, is an excellent solution in terms of price-power-quality ratio. And so, in the main role today we have a microcircuit of the STK series. Stk microcircuits are hybrid microcircuits that are made on frameless transistors using thick film technology and laser adjustment of the values of all resistances. I, like a fairly large number of radio amateurs, consider these amplifiers to be one of the best and bypass the well-known TDA and LM in terms of sound quality. Of course, you can also remember tube amplifiers, but this is a rather vague topic, and besides, today it’s not easy to find standing lamps and transformers, and if you succeed, then the prices for such exhibits are not the lowest. Well, as for microcircuits, they are only gaining momentum and it is not difficult to find the necessary strapping details for them. If you dig deep into the industry and consider the range of microcircuits that most companies install on their sound reproducing devices, you can see an interesting trend, for example, if you consider almost any budget-level speaker system (1000-2000 rubles), then at best you will find tda7294 or tda2050 there . Manufacturers resort to such a solution since the microcircuits of this series are not picky about power, they require an extremely small amount of external piping (resistors, capacitors, coils), and sometimes they do not require it at all. If you try to consider already more expensive and high-quality speakers, then in most cases you can see either transistor amplifiers or the same STKs.
In this article, we will consider the STK402-120S microcircuit. One of the advantages of the “STK402-020 ... STK402-120” line is that each of these microcircuits has exactly the same binding, and the last value (..120) indicates the maximum power that this microcircuit is capable of provide (120W). This means that everyone will be able to choose the power that he needs, and if it ceases to suit him, it will be enough to replace only the microcircuit with a higher denomination and, in some cases, the power transformer with a higher voltage.
And so I think it’s worth moving on from practice and we’ll start with the parameters of the entire model range:
And the characteristics of our particular amplifier:
After the announcement of all the characteristics, I think you can proceed to the assembly. And we will start the assembly as it should be with food. It uses a bipolar power system, or as it is also called power with a midpoint. Here is the diagram of our power supply:
In power supplies of this type, there is a minus and a plus and a ground (case). The voltage specified in the parameters, namely + -39 V, is the voltage that must be between plus / minus and ground, i.e. between plus and minus should be 78 V.
Then consider the circuit of the amplifier itself:
Output resistors of 0.22 ohms and 4.7 ohms must have a power of at least 2 watts, the rest can be taken at 0.25 watts. Also, the maximum voltage of electrolytic capacitors of 100 and 10 microfarads must be higher than the supply voltage.
Well, now I think you can go to the assembly. I was partially lucky and got my hands on an old music center from which not a small part of the details was borrowed.
Again, let's start with the power supply. This was the main part that I borrowed.
The transformer gave out + - 50, but this is quite within the allowable parameters of our microcircuit. There was only one problem .. Since the smoothing capacitors were on another board, they had to be soldered and made their own board:
Here is the final photo, so that there are no questions, I’ll immediately say that most of the non-polar capacitors in this case are in the same cases as the resistors. In addition, two 4.7 ohm output resistors are missing in this photo.
On this, most of the work came to an end, it remains only to remove all the components into the case and fix the microcircuit to the radiator.
In my case, I decided to use the same case from the music center.
Sanyo's original microcircuits, the STK402 series, are hybrid microcircuits and they are made using thick-film technology on packageless transistors. Another feature is the laser adjustment of resistance values.
These amplifiers have excellent sound and performance, and many amateurs put them in first place before amplifiers assembled on TDA and LM chips, although opinions sometimes differ.
Below is a table of some of the parameters of some of the most popular microcircuits of the STK402 line.
STK402-070 and other microcircuits of this series have quite large, even huge cases. All microcircuits indicated in the table are full analogues and are completely interchangeable, but, as you may have noticed, they have different supply voltages, as well as different package sizes.
The load resistance should not be less than 6 ohms, this is a feature of these microcircuits.
Circuit elements
Resistors of 0.22 Ohm and 4.7 Ohm should be 2W, the rest 0.25W.
Electrolytic capacitors (all) must be rated for a voltage greater than one and a half times the supply voltage. I used 50V electrolytes.
I used polypropylene non-polar capacitors with a capacity of 0.1 μF, although this is not necessary (I installed it for beauty), so we put ceramics. All other non-polar capacitors are also ceramic.
Chokes are wound on a mandrel (drill) with a diameter of 6-8 mm and have 25-30 turns, wires with a diameter of 0.6-1.2 mm. I wound it with 1.2mm wire, it is more convenient for them to wind, the choke does not unwind, and it will also be good to hold high currents at maximum power. Chokes are wound in two layers of 15 + 15 turns.
When listening to the amplifier on the STK402-070, I really liked it, especially at the maximum volume, very little distortion is heard, the sound is clear and rich. After some listening, I decided to increase the power of the amplifier and installed STK402-120, and also increased the supply voltage, while the power increased significantly, and the sound remained the same excellent.
On a chip STK4048XI. We offer a slightly modified circuit of this amplifier based on STK microcircuits. With the circuit itself unchanged, and replacing only the microcircuits from the list below, you can change the output power of the audio frequency amplifier depending on your needs 6 to 200 watts. Depending on the marking microcircuits STK they have different levels of non-linear distortion: II - 0.2%; V - 0.08%; X - 0.008%; XI - 0.002%.
An approximate layout of radio elements on a printed circuit board:
At all microcircuits STK This series provide high output power and low THD. This allows you to get sound reproduction with high sound quality from the amplifier.
The supply voltage is bipolar from 20 to 95 volts (it varies depending on the brand of the microcircuit, see table). Amplifier load at least 4 ohms; optimal - 8 ohms. The input impedance of the UMZCH is 55 kOhm. Quiescent current is 120 mA. Output current up to 15 amperes (depending on the microcircuit used, see table). Chips of the STK40** series require the use of a radiator with an area of at least 400 mm 2 . For efficient heat dissipation, you can screw the chip onto the heat sink using heat-conducting paste.
The list of microcircuits in the table will be incomplete if we do not mention two more markings of this series, which provide an output power of the assembled amplifier of 200 watts. This STK4050II and STK4050V. The recommended voltage for the circuit on these microcircuits is at least 66 volts, and the maximum is 95 V.
Assembled amplifier on STK4050 with an output power of 200 watts:
