61

CP4500 Stereo Bus Compressor / Re: No output when engaged

« Last post by JPK on September 17, 2024, 10:23:54 AM »

TP12 14.54V
Does the DC voltage on TP12 goes to 0V when turning the MIX pot CCW to 0?
Check value, direction and solder joints of U22, P3, R90...R94.

62

CP4500 Stereo Bus Compressor / Re: No output when engaged

« Last post by jd.musicology on September 16, 2024, 09:02:32 PM »

Yes JMP1 is inserted. I'm using Studio One to generate the tone. I can't get it to output 3 VAC. Here are the measurements:
1.1-

V+ =+15 to +16VDC,15.95VDC V-  =-15 to -16VDC), -15.92VDC +12V = +11.1 to +12.9VDC, 11.73VDC -12V  = -11.1 to -12.9VDC -11.83VDC

1.2

TP1, TP2, TP3, TP4, TP11, TP12 = 0VDC  TP1 -0.1mV TP2 0v TP3 0v TP4 -0.6mV TP11 8.2mV TP12 14.54V

1.3
TP12 goes from 0 to -2.3VDC
Stays at 14.5V
1.4
TP13 goes from -1.8V to +2.8VDC
-1.78 to 2.86VDC
1.5

• TP4 goes from 0.060VAC to 0.190VAC .22VAC to .037VAC

TP5 goes from +0.35VDC to -1.2VDC -1.5VDC to 342mV DC

63

First Aid / Re: sk49 missing neoprene tubing and copper wire

« Last post by JPK on September 16, 2024, 11:10:34 AM »

Sorry for this.
We will send you the missing parts today.

64

First Aid / sk49 missing neoprene tubing and copper wire

« Last post by mikemorasky on September 16, 2024, 12:24:36 AM »

Seems really basic and I'm happy to go buy some if you can give the specs or a link
thank you

65

CP4500 Stereo Bus Compressor / Re: No output when engaged

« Last post by JPK on September 14, 2024, 12:21:55 PM »

Do you have the jumper JMP1 inserted ?
Can you report the voltages you get from here?

66

CP4500 Stereo Bus Compressor / No output when engaged

« Last post by jd.musicology on September 13, 2024, 11:08:40 PM »

Hello 1st time builder here. I have built amplifiers and microphones with great success so I know how to use an iron. I'm going through the setup guide, at step 5 all the voltages check out within tolerance. Step 6 I get the sine source going and adjusted to 2 VAC. When I engage the unit 0 V. I can confirm listening to the audio I hear it then engage the unit, no sound. Voltages at TP1 .999, TP2 .008, TP3 1.002. Any help is appreciated!

67

CP4500 Stereo Bus Compressor / Re: Meter lights dont turn off when in bypass

« Last post by JPK on September 13, 2024, 03:16:22 PM »

This is normal. The meter light stays on when the lunchbox is on, independently from the bypass.

When in auto release, the needle creeps back to 0 veeeeeery slowly.
Check that capacitor C2 is in the correct direction.

68

CP4500 Stereo Bus Compressor / Meter lights dont turn off when in bypass

« Last post by Tinu_CH on September 12, 2024, 08:36:29 PM »

My meter LEDs wont turn off when i press the bypass button - Any hints on this? Other than that, the comp works fine. 

When in auto release, the needle creeps back to 0 veeeeeery slowly. But i guess thats how it should be? On other releasw times, it feels perfectly responsive. 

Thanks for your inputs, JPK!

69

EQ573 Equaliser / Re: 12-position switch has too many legs?... (Three pole switch, one pole on PCB)

« Last post by JPK on September 10, 2024, 10:13:43 AM »

am i right in the assumption that cutting any leg would have worked, but resulted in the wrong sequence of 
frequencies?
Absolutely right.

70

EQ573 Equaliser / Re: 12-position switch has too many legs?... (Three pole switch, one pole on PCB)

« Last post by Tinu_CH on September 09, 2024, 12:53:39 PM »

Thanks JPK! 

If i may ask - am i right in the assumption that cutting any leg would have worked, but resulted in the wrong sequence of
frequencies? I tested the switch with a DMM, and each outer leg did make contact with all three inner legs when active. 

Plus the inner legs had contacts between them as well. 

Best and thank you for the fast help. 

Martin