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Old 18th May 2013, 11:11 AM   #231
sonnya is offline sonnya  Denmark
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6 n-channel
4 p-channel

Is that what you mean?
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Old 18th May 2013, 11:27 AM   #232
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6n
2p
If this messes up your matching, I am willing to pay extra. I just dont want to have to buy in qty necessary to match for such a small amount. Hoped you might have some already.

THis may sound stupid, but do you like the input bjt's that you used in this amp? I am buidling a littel BJT based preamp and looking for alternatives to ZTX450/550. Would really like SMD parts that are well suited for audio. I am new to bjt's
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Last edited by buzzforb; 18th May 2013 at 11:30 AM.
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Old 19th May 2013, 05:18 PM   #233
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by buzzforb View Post
6n
2p
If this messes up your matching, I am willing to pay extra. I just dont want to have to buy in qty necessary to match for such a small amount. Hoped you might have some already.

THis may sound stupid, but do you like the input bjt's that you used in this amp? I am buidling a littel BJT based preamp and looking for alternatives to ZTX450/550. Would really like SMD parts that are well suited for audio. I am new to bjt's
No problem.

If i would give you an advice, it would be to stick with the following parts. They are easy to get and has an good performance.

They are well suited for low to mediumhigh source impedance. the hFE linearity is good, stray capacitance is low (Which is very good as it is very unlinear), noise level is okay, Ft is high.

BC846B/C, BC856B/C (65V)
BC850B/C, BC860B/C (45V)
BC847BS, BC857BS (45V) (dual)
BC846BS, BC856BS (65V) (dual)
BC847BPN (45V) (NPN and PNP in one package)

Matched variants:

BCM847BS, BCM857BS (45V) (dual) (vbe match <2mV, hfe match max 10% deviation).

For higher current rating:

BC807 and BC817.

For very good match i would choose SSM2212 and SSM2220.


ZTX types has low rbb which gives low noise, but stray capacitance is very high. They are best suited for MC preamps.

i hope it is usefull.

Last edited by sonnya; 19th May 2013 at 05:25 PM.
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Old 19th May 2013, 07:05 PM   #234
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GReatly appreciated Sonny. I will send you a board of the pre when it is done as a thanks. Let me know qhat I owe you for the fets.
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Old 19th May 2013, 07:06 PM   #235
sonnya is offline sonnya  Denmark
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Old 29th May 2013, 07:03 PM   #236
Siberia is offline Siberia  Lithuania
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Alright, insulators placed. 18V across J7 and J8 set. Although, can't bias right. While turning R22, I get my 40W bulb tester going from very dim to bright lit. Soft start shuts the amp down at a point near 30 mV across R30. What's my problem?
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Old 29th May 2013, 07:17 PM   #237
sonnya is offline sonnya  Denmark
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If softstart shuts down. I suspect it might have taken a hit.

Start without the softstart.

Secondly Adjust R30 for 20mV and measure across R31. That should roughly be the same.
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Old 29th May 2013, 07:24 PM   #238
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Will the dim bulb not keep him from properly biasing the circuit. Isnt it just meant to be a tool for testing for shorts or major problems, as it will eat more voltage as the current is increased.
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Old 29th May 2013, 07:27 PM   #239
Siberia is offline Siberia  Lithuania
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Does that mean my bulb tester is performing OK, when bias is turned up? Otherwise the protection circuit operates normaly turns on and turns off when asked.
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Old 29th May 2013, 07:36 PM   #240
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the more bias, the brighter the bulb will burn, is it drops a voltage relative to the current passing through it. The fact that you are able to adjust it would indicate that you have no shorts. I am not sure how your soft start works, but most of the time, they are simplky there to slow down a current rush at start up. Perhaps Sonny has more insight, but it seems like the dim bulb is unnecessary at this point. Where in the chain is the dim bulb tester? Before or after soft start?
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