TIP42C PDF

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As owner of this device I also wanted a good readable diagram. The Palstar below is almost similar except two red coloured components. The unit is used in many shacks but it has some shortcomings, which have resulted in failures.

Fortunately the device can be improved by some modifications. Such protection is still not in my EP installed. You know the routine, the plan exists but it need not be directly because I have other power supplies available.

When use the EP with a transceiver I always connect a small battery in parallel. At right fig. It is almost a standard "brute force" circuit with a Zener diode driving a thyristor, which short-circuit the overvoltage, a fuse blew and the set is no longer energised.

Details of such security can be found on the Internet. A less crude system fig. If the voltage at the terminals is too high, the thyristor is conducting and the voltage is reduced to a safe value by the large current through the 0.

Simultaneously, the voltage across the relay is almost zero and disconnects the load. This is not a brute force system and the thyristor is less affected.

Both rectifiers are only suitable for continuous use with about 12 A or 15 A and not to the specifications of a 25 A continuous current or 30 A peak current. One has experienced that a sustained large current will develop a fault. I did not believe the factories specifications and therefore I tested the supply thoroughly. The rectifier collapsed, but that was partly due to lack of cooling. The cause: the mounting screw and nut were lose and there was no thermal paste applied between bridge rectifier and heat sink.

It is advisable to check all the fixing and thermal paste because my transistors were providing with almost nil paste. After a 50 A rectifier bridge was installed the power supply specifications were right and the unit has not failed since Again, check your power supply for essential fixings and sufficient thermal paste.

Temporarily components can have a reverse polarity and failure. In case of wrong connection the diode conducts and the fuse blow. That is mainly because the insufficient mounting of all components. Now the airflow is sufficient with less noise. He was not satisfied with the voltage stabilization at maximum load. In examining the cause he discovered a number of weaknesses of the design. In his enthusiasm to proceed, he thought the changes might be too far.

However the result was a safe, quiet and stable The output voltage varies considerably due to the heavy load of the system to the other secondary winding and probably by thin wire on the primary windings. To improve, he replaced D13 1N with an additional 24 V stabilizer mounted on the heat sink and a track was interrupted. Since C17 was not installed in his EP he mounted a nF capacitor.

The changes are marked in red. The circuit for the fan is simplified. The circuit of the LM IC1 voltage regulator could be improved.

Resistor R7 1. The inputs of the LM were designed for lower voltages up to 9 V to the outputs. He chose for He decreased the maximum voltage across VR3 5 kOhm to 14 V with a 1. A zener diode ZD2 and resistor ohms across the output trigger the action. FAN In his opinion the circuit for the fan is overly complicated: a thermostat, two opamps and a transistor to switch a fan!

I am agreeing! The reason is probably the use of an NC Normal Closed thermostat. Thus reduces noise considerably.

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