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Messages - Jazz P Bass

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181
Amplifier Discussion / Re: Heatsinks for your poweramp
« on: December 11, 2017, 10:45:07 AM »
Those are nice Ic's.

Good to know that they are robust enough to survive being 'hooked up wrong'.

Any idea what mistake you made?


182
Amplifier Discussion / Re: Heatsinks for your poweramp
« on: December 10, 2017, 01:55:41 PM »
The LM386 is Not simply an opamp.
It is a power amplifier in it's own right.

The quiescent current with a 12Vdc supply is in the milliwatts.
So that wont make you say ouch.
The power dissipation of the package is 500 milliwatts (1/2 watt).
Again, no need for a heatsink.

If the device got that hot, it is hooked up wrong.
Most probably it is now bad.

183
The Newcomer's Forum / Re: New here - JC-120 #492020 - chasing down info
« on: December 05, 2017, 12:56:52 AM »
Good Luck!

184
Yeah, there is not too much if anything 'out there'.

Layout drawing?

Hmmph.

185
The Newcomer's Forum / Re: Londoner L100A
« on: November 05, 2017, 11:25:04 AM »
Yeah, that's a 'ground' buss.

Not too sure about the slave.

186
The Newcomer's Forum / Re: TDA 2030 Guitar amp build oscillation problem
« on: October 05, 2017, 02:02:40 AM »
I would have to question where you purchased the TDA2030 ic's.

That ic is no longer in production.

LM1875 is.

187
The Newcomer's Forum / Re: TDA 2030 Guitar amp build oscillation problem
« on: October 01, 2017, 12:00:41 PM »
Understand that the reason for the capacitor on the output is because the power supply is a single polarity.

Therefore the output will 'sit' at 1/2 of the supply voltage.
Which is Volts dc.

The cap is not needed on a dual supply because the output 'sits' at 0 Vdc.

188
The Newcomer's Forum / Re: HH MA150 blowing mains fuses
« on: September 30, 2017, 10:45:26 AM »
HH MA150 schematic:

189
The Newcomer's Forum / Re: TDA 2030 Guitar amp build oscillation problem
« on: September 29, 2017, 12:34:29 AM »
"How does a dc voltage burn out a voice coil"?

Heat.

190
The Newcomer's Forum / Re: TDA 2030 Guitar amp build oscillation problem
« on: September 27, 2017, 10:11:28 AM »
Have you installed C3/ C9 (0.1 uf) & R4/ R10 (1 ohm)?

191
Amplifier Discussion / Re: LM 3886 current feedback poweramp
« on: September 22, 2017, 10:09:41 PM »
Good to keep in mind that the IC output potential is totally dependent on the power supply voltages into a load.

Within the limits defined in the datasheet.

193
Amplifier Discussion / Re: Marshall Lead 100 MOSFET 3210 Head
« on: June 17, 2017, 04:55:53 PM »
If you replaced the original mosfet's, I'll buy them.:)

194
The Newcomer's Forum / Re: Quick Transistor lesson for Idyuts
« on: June 09, 2017, 09:45:38 PM »
NPN: "Never Points iN"

195
The Newcomer's Forum / Re: Quick Transistor lesson for Idyuts
« on: June 04, 2017, 08:19:31 PM »
I believe the proper term for the PNP letters is: Points In Perpetually".

Other than that, nice job.

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