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Old 18th December 2012, 04:49 PM   #301
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Kean, in post 293 I see you changed the 327/337 from -25 type to -40 type ?
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Old 18th December 2012, 05:28 PM   #302
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I keep waffling, in simulation all the gain groups act the same so I use the -40 gain group when convenient. The models are from NXP/Phillips and always seemed to be very good quality, so I would not be surprised to find the -40 gain group working as expected in reality.
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Old 18th December 2012, 10:28 PM   #303
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about how to test it when built

I suppose it works ok if it shows the expected voltage drop of 1.5V ?

ah, the *Troubleshooting* chapter on your website
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Old 19th December 2012, 12:55 AM   #304
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Old 19th December 2012, 11:14 AM   #305
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the SMPS issue brought up here could have another interesting angle/aspect

I have a box loads of those standard wall plug thingies
tried to use one with my guitar effects
but even with this a simple regulated DIY supply sounds better

now Im thinking if the K-multiplier might help to filter the SMPS
but should be easy to check
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Old 20th December 2012, 01:19 AM   #306
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You could build Tangent's low noise measurement pre-amplifier :

Low Noise Measurement Preamplifier

I have an old 12Mhz scope that goes down to 1mV, and my Fluke is only accurate to 1 or 2mV too, so I'm stuck for precise measurement - so I follow theory and let my ears decide. After all, I do this hobby because I enjoy listening to music as well as making things.
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Old 20th December 2012, 08:43 AM   #307
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Hello Kean,

Could I replace BD139 with MJE340 or KSE340?
C1 have to be rated 400V?

Last edited by merlin el mago; 20th December 2012 at 09:05 AM.
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Old 20th December 2012, 09:04 AM   #308
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I would not. It probably has terrible quasi-saturation parameters.
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Old 20th December 2012, 09:06 AM   #309
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Ok I will order BD139, wich voltage required for C1 82uF? All resistor 1/4W, metal or carbon? LEDs 2V 20mA?

Last edited by merlin el mago; 20th December 2012 at 09:13 AM.
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Old 20th December 2012, 09:21 AM   #310
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C1 should have the same voltage rating as your reservoir caps. All resistors can be anything 1/4W.
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