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Juma's Easy-Peasy Capacitance Multiplier
Juma's Easy-Peasy Capacitance Multiplier
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Old 15th November 2018, 01:35 PM   #631
Mark Johnson is offline Mark Johnson  United States
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Juma's Easy-Peasy Capacitance Multiplier
Be sure to check the emitters of T1 and T2 with an oscilloscope, looking for unwanted excess ripple when delivering the maximum permitted output current. This circuit's behavior gets worse and worse as you increase the output current, so: check it and double check it at MAX current.

You may need to adjust the values of R2 and R6 to find a compromise between (A: total voltage drop from in to out) and (B: ripple), that you can accept. Post #35 says more about this.

R2 = infinity gives the least ripple and the largest (total voltage drop from in to out)

R2 = zero gives the most ripple and the smallest (total voltage drop from in to out)
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Old 16th November 2018, 06:04 AM   #632
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
Thank you Mark for your suggestions.
As per the Juma's schematic , the values are 12k Ohm for the R2 and R6.

Also requires a regulated input for the circuit , so the on-board rectifiers + CRC may not be such a good idea.

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Prasi
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Old 16th November 2018, 07:07 PM   #633
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
Would this work well with a regulator up front... may need some thinking on cap values and voltages. bloody symmetrical and no jumpers...
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