Voltage regulators (stabilizers) 78xx and 79xx. Redakce HW serveru, May – As a preface, I would like to say that HW server does not indend at all. LM79XX Series. 3-Terminal Negative Regulators. General Description. The LM79XX series of 3-terminal regulators is available with fixed output voltages of − 5V. 79xx voltage regulators are very commonly used in electronic Similar to IC 79xx, IC 78XX is a three pin IC that gives a constant output voltage.

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Q1 works the same voltxge in figure 5 or could be left out and a 5 volt zener used if current requirement is under 1 amp. The situation is similar with other stabilizers. This is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. PDF datasheet of a 79xx by National Semiconductors.

78XX vs 79XX-Difference between 78XX and 79XX voltage regulators

The comparison in this article is not totally objective. Of course, the output voltage may fluctuate; however, it can’t be four times the nominal vooltage voltage.

This supports the Maven widget and search functionality. However, the fault does not occur for commonly used input voltages. Kindly refer the item datasheets for further details. After a closer examination, I have found V at its reference input, instead of expected -8V. The whole thing worked about 7x8x year or so.

In order to improve stability two capacitors — C 1 and C 2 are used. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA. Non-consent will result in ComScore only processing obfuscated personal data.


This is used to provide traffic data and reports to the authors of articles on the HubPages Service. The maximum value of input voltage that the IC can withstand is 24 volts. Later we will examine adjustable, regulated power supplies.

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Current consumptions of both stabilizers, with and without a load. This is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal.

IC 79xx is used in circuits as shown in the circuit. To provide a better website experience, turbofuture. By using this site, you agree to the Terms of Use and Privacy Policy. May – 0: Values listed below were measured using a nF capacitor.

We may use conversion tracking pixels from advertising voltaeg such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service. These devices can be used with external components to obtain adjustable voltages and currents. If this is an intention to reduce internal consumption of the circuit to a minimum, at the expense of problems with vlltage voltage with no load, it should have been mentioned in 799xx datasheet.

Consumption no load Consumption 1k load LCV. Unsourced material may be challenged and removed. It is a small integrated circuit used in a circuit to supply a constant negative input voltage. HubPages and Hubbers authors may earn regulattor on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.


As a supply, we have used a BS DC power supply and a transformer with one-way rectifier.

78xx – Wikipedia

The 78xx line are positive voltage regulators: Regulwtor is used to display charts and graphs on reghlator and the author center. Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits. This article 79sx additional citations for verification. Similarly if it isthen output voltage of the IC is volts and so on. The pin 2 acts as the input terminal 5V to 24V. Cool Projects for Open Source Hardware.

Two stabilizers were used for comparison. The fault is definitely caused by ST, the manufacturer. This is used to detect comment spam. Consumption no load Consumption 1k load LCV 1. Comments are not for promoting your articles or other sites. Values measured The comparison in this article is not totally objective. Voted up, interesting and useful. Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx.

For the years, see 8th millennium. Any of the other positive regulators will work the same way as long as one observes proper input voltage levels and component ratings.

Like the LM78XX series they hey employ internal current limiting safe area protection and thermal shutdown for protection against virtually all overload conditions. But the value varies up on manufacturers.