Anyone Use a Series Resistor in their BGT to Limit Current?

Posted by Maxamillion (A) on November 17, 2015 at 08:42:58

Seems like it would be good practice to add a series resistor of a few ohms in the + leg of the BGT, between the battery and cap, to limit current on first charging. A 47,000uF cap will pull a LOT of current when first connected to a 9V battery, which might damage the battery or cap. Since we don't draw any current from the BGT in use I can't think of a reason NOT to add a resistor...anyone do it?

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Topic - Anyone Use a Series Resistor in their BGT to Limit Current? - Maxamillion 08:42:58 11/17/15 (17)

Here's what I Ended Up Doing (pics) - Maxamillion 20:27:51 11/25/15 (4)

Listening impressions - Maxamillion 04:51:14 11/27/15 (3)

Ditched the Bypass Cap...Better Balance - Maxamillion 04:46:20 11/29/15 (2)

Actually, - QuadTodd 15:34:31 11/29/15 (1)

Agreed, but in power supplies - Maxamillion 15:40:14 11/29/15 (0)

RE: Anyone Use a Series Resistor in their BGT to Limit Current? - Lew 12:01:37 11/17/15 (11)

I meant for the initial chargeup of the cap - Maxamillion 12:31:16 11/17/15 (10)

I just looked up the internal impedance - Maxamillion 12:41:03 11/17/15 (9)

RE: I just looked up the internal impedance - Lew 13:45:18 11/17/15 (8)

A Discharged Cap is a Short Circuit to DC - Maxamillion 17:53:36 11/17/15 (7)

RE: A Discharged Cap is a Short Circuit to DC - Lew 06:58:43 11/18/15 (5)

+1 Use larger battery to precharge. n/t - tweakmenow 04:43:19 11/19/15 (0)

RE: A Discharged Cap is a Short Circuit to DC - Maxamillion 08:27:05 11/18/15 (3)

RE: A Discharged Cap is a Short Circuit to DC - Lew 10:15:57 11/18/15 (2)

That's .047F, same as 47,000uF - Maxamillion 10:23:42 11/18/15 (1)

RE: That's .047F, same as 47,000uF - Lew 12:25:16 11/19/15 (0)

Here's a Startup Simulation in LTSpice - Maxamillion 18:32:12 11/17/15 (0)

Anyone Use a Series Resistor in their BGT to Limit Current?

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