Soldering iron tip temperature regulator. Scheme, description

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Soldering iron tip temperature regulator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Usually, to set the optimal temperature of the soldering tip, a trinistor regulator is used, variants of which have been repeatedly published on the pages of the Radio magazine. However, such a regulator has a significant drawback - it creates interference in a wide frequency range. As practice has shown, even the inclusion of a filter at the input of the regulator does not eliminate this drawback.

By the way, the filter at the output of the regulator is usually not installed at all, and the wire of the soldering iron becomes the "emitter" of interference. And this does not allow, when the soldering iron is on, to establish highly sensitive devices (for example, a microphone amplifier or a tape recorder playback amplifier).

There is only one way out in this case - you need to use a regulator in which there is no trinistor. A diagram of one of the variants of such a device is shown in the figure.

Soldering tip temperature controller

Five independent switches (SA1-SA5) allow you to "gain" the required capacity of the ballast capacitor and set the appropriate power on the soldering iron plugged into the XS1 socket. The smallest power will be when the SA1 contacts are closed, the largest - when the contacts of all switches are closed.

With the values of the capacitors indicated in the figure, you can change the power released on the soldering iron from 15 to 60 W, and also power a soldering iron designed for a voltage of 127 V (if someone else has one).

To expand the range of power adjustment in the region of 40 ... 60 W, a diode VD1, a limiting resistor R2 and a switch SA6 are introduced into the device. The combination of a diode and a ballast capacitor (or several capacitors) distorts the voltage waveform at the load, but the level of distortion (and hence the noise generated by the regulator) is significantly lower compared to a trinistor regulator. With a diode and capacitors, the effective voltage across the soldering iron can be somewhat higher than the mains voltage.

The maximum load power (60 W) is determined by the allowable current flowing through the Zener diode VD2 and resistor R4.

If the power of the soldering iron is known in advance, a smaller number of control steps can be dispensed with. So, when using an EPSFA soldering iron with a power of 18 W, the regulator does not need capacitor C5, switches SA5 and SA6. The right terminal of the resistor R2 according to the scheme is connected directly to the terminals of the remaining capacitors connected together.

The diode must be powerful, withstanding a large impulse current, since situations are possible when the entire capacitor bank is discharged through it. Capacitors - K73-17, C4 and C5 are made up of several smaller capacitors connected in parallel. Although the diagram shows nominal voltages of 250 V, most of these elements withstand mains voltage. It is easy to verify this by connecting them to the network before installation through a 1 A fuse. Of course, you can immediately install capacitors for a voltage of 400 V, but then the dimensions of the device will increase significantly. All switches - PDM1-1.

The regulator can be made in a plastic case, on one side wall of which you can install a socket for connecting a soldering iron, and bring out the power cord through the hole in the other.

Author: O. Fedorov

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