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| RPS with from 0-30V and Current variable up to 3 A design Circuit Please.... |
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| techguru:
Dear all, For past three month i have been designing a variable power supply which gives 0-30V and Current variable up to 3 ampere from zero. can some can give working Schematic so that i would understand and complete my project. thank you all.. |
| rstofer:
https://www.eevblog.com/forum/beginners/diy-0-30v-0-3a-again/ See Reply #7 Most of these projects fail to meet the specifications. Some can't get down to 0V because they don't have a negative supply for the op amps. Some can't handle low voltage with high current because there is too much voltage drop across the output transistors. None have transformers with taps to solve this issue. The Internet is full of circuits that don't work. If there was one that did, it should be posted as a 'sticky'. |
| David Hess:
30 volts at 3 amps is a tough row to hoe without a lot of extra complexity. 90 watts worst case requires multiple transistors and 30 volts peak is marginal for common operational amplifiers which have an absolute maximum voltage rating of 36 volts. 20 volts at 1 amp is much easier. |
| techguru:
Hi to all, The above said opamp Vcc problem is true. What are the opamp whose Vcc greater than 40V and above in single supply operation. So that I could use it in my circuit.thank you all. |
| BravoV:
--- Quote from: techguru on January 06, 2019, 05:54:31 pm --- For past three month i have been designing a variable power supply which gives 0-30V .... --- End quote --- 3 months ? Its been almost a year Gurumurthy ... (this guy previous nick). The same guy that keeps haunting this forum for his 723 based PSU, as he keep posting another new thread "AGAIN AND AGAIN" if he does not have the component in his drawer as the circuit needs, and keeps nagging until someone give him a circuit that can do 30V 3A 723 based PSU with components that he owns. :palm: Reference -> https://www.eevblog.com/forum/projects/how-to-calculate-potentiometer-value/msg1237728/#msg1237728 |
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