The relay is used to switch off the power supply voltage when the mains (S1) are/is switched off.
It does not store any personal data.S2 switches between +- 3 Amps and full output current The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. The circuit has the benefit of a belt and braces approach to the problem – where each of the power transistors are relatively unstressed, however should one decide to short circuit, whatever 12 volt device is connected will receive the full force of the 24 volt supply so it would be good if the belt and braces theme was taken a stage further and provide some failsafe protection for the possibly expensive equipment that would connected to it… The circuit does assume the transistors are all matched for gain when in reality that is unlikely and when so many cheap “seconds” are on the market the actual gain can vary wildly causing, perhaps, a single transistor to do the lion’s share of the work. Now begin to turn the preset so that the lamp lights and the tester shows 12V.that's all, your 20 amp 24V power supply circuit is set and ready to be usedĪdmin should have mentioned the actual typical low DC gain of the 2N3055 does require a relatively high base current of around 3/4 amp for full saturation, but as each transistor is expected to provide only something just over 3 amps, a base current of 0.15/0.2 amps should do the trick if the response is reasonably linear.Ħ x 0.2 = 1.2 amps, which is uncomfortably close to the 1.5 amp rating of the LM317. At the output side, parallel to the lamp, attach a continuous scale tester having a appropriate rating (about 50V).
On the output access, link-up the batteries in series with what may be accomplished as 24V. Position the 10K preset at the maximum go (or open the 10K preet connection) and hook up to the converter output lamp 12V / 50W. Needless to say, all components (transistors and integrated) should be mounted on a large heatsink for facilitating good heat dissipation as well as must be electrically isolated from the heatsink metal. The indicated 12v connection may be the output and the Gnd connection needs to be grounded. Where it is shown as the 24v connector could be the input through the batteries. These transistors carry out the major function as may be witnessed while the regulator IC simply manages maintaining these correctly. Although a lot of installers make use of a cable through the association of the pair of batteries to obtain 12V which means a lot of wire, and this is not really advised because this impacts on the proper efficiency of the accumulators and also causes discharging of the battery more along with all the accompanying issues that this may result in.Īs evident, this 20 Amp adjustable power supply circuit is actually simply an adjustable integrated voltage regulator which can be seen engaged on several parallel power transistors. This circuit is quite popular among vehicles or busses in which the batteries offer 24V including different things within the electrical circuit where 12V may be essential.