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Messages - Jazz P Bass
1
« on: February 15, 2019, 11:18:15 AM »
How are you setup test equipment wise?
There are signal voltage references on the schematic that may help narrow down where the issue lies.
2
« on: January 25, 2019, 12:44:21 AM »
The IC U2B is set up as a self running low frequency oscillator.
Look above it at IC U3B, pin #9/ R20 also has the Lambda symbol.
I take it that R20 is the LDR.
U2B's oscillating output will allow a change in the resistance of R20.
There is your Tremelo.
3
« on: January 17, 2019, 11:25:32 AM »
If the are all 8 ohms, then the equation works out to 5.33 ohms.
4
« on: January 14, 2019, 01:51:05 PM »
For those following along:
5
« on: January 14, 2019, 12:00:25 AM »
Schematic?  ?
7
« on: January 01, 2019, 12:03:16 PM »
I believe that you are missing the point of the Earth connection.
"Wall Wart" power supplies are typically rated as 'Double Insulated'.
Therefore there is no need for a connection to Earth Ground.
If you are having noise issues with the amplifier, I would look into why.
The power pack itself may be the issue, noise wise.
8
« on: December 30, 2018, 03:53:01 PM »
"so how do I determine which of the pins is which/is ground?"
Use your ohmmeter.
The ft sw ground pin will be at the same potential as the chassis.
The function pins will not.
9
« on: December 30, 2018, 12:39:46 AM »
Pull any function pin to ground & it will 'operate'.
10
« on: December 25, 2018, 11:39:36 AM »
Yeah, I really did not study the circuit for too long.
I do believe the OP is asking too much from a Forum.
11
« on: December 24, 2018, 12:37:40 PM »
I would try changing R76 to a lower value.
(coming off of the OD Lvl wiper.)
12
« on: December 05, 2018, 01:19:15 AM »
There are a bevy of class d amps available on the net.
Small & simple.
Pick one that utilizes the +40/ -40 Vdc supply that you have.
13
« on: December 03, 2018, 11:26:27 AM »
Why are you going down this road?
14
« on: December 01, 2018, 12:47:15 AM »
See if this is close:
15
« on: November 30, 2018, 12:38:03 AM »
"Well fellas, as I practiced putting filter caps In a second Peavey amp head I bought to tinker"
Which model amp are you now working on?
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