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I had a friend lay out a pcb for me, that implements the sigbal control that is in the whites 5900 schematic.
It is laid out for either through hole resistors or chip resistors. The whites 5900/Di pro sl schematic, shows this as an add on board number 801-1152, so I decided perhaps
I could get one laid out.
It uses an 8 pin DIP TLC271CP
I just got the package from him, this zip has the gerbers, and the schematic, along with a board printout, but not one that is usable for hand etching.
i.e. there is no 1:1 trace printout. I would love to have one, if someone can pull the gerbers in and print the trace layer into a PDF.
Eventually I'll probably get it, but right now he doesn't have a printer installed on the laptop he used to do this.
Parts list
TLC271CP
10K audio taper (15A) the board is laid out such that a pot should be able to be soldered into the holes, and the board essentially attached to the pot, OR, as I am going to do,
with wires, and glue it to the chassis somewhere.
.012 uf 5%
11.34K 1% 68.1 1% 6.34K 1% 34.8K 1%.
According to the whites schematics, typically there is a cap between the NE5534 and the input to the X phase detector. On can remove that cap, and wire the input to the side that was connected to the NE5534, and the output to the other side of the cap. There may be a resistor as well. This requires +7 V -7 V and ground. that is, the board sits between
the NE5534 reciever amp, and the next5 block in the chain. In the case of the 5900 di pro, it appears that there would be a 1K resistor R115 that cound be lifed on one end.
Not sure what my 4900 has, but I am pretty certain I'll be able to insert this into the signal path in the 4900, which is my goal. I don't know if sigbal is present on the normal daughter card for the 5900, I will eventually look, but if it isn't then I'm going to try inserting this into the circuit.
That combined with the 4900 sensitivity control ( a pot that controls current through the tx loop driver) I should have quite a capable detector.
I will probably hand built a couple of these for my own use, but if there is enough interest, I might be able to get some made at a board house somewhere.
enjoy.
It is laid out for either through hole resistors or chip resistors. The whites 5900/Di pro sl schematic, shows this as an add on board number 801-1152, so I decided perhaps
I could get one laid out.
It uses an 8 pin DIP TLC271CP
I just got the package from him, this zip has the gerbers, and the schematic, along with a board printout, but not one that is usable for hand etching.
i.e. there is no 1:1 trace printout. I would love to have one, if someone can pull the gerbers in and print the trace layer into a PDF.
Eventually I'll probably get it, but right now he doesn't have a printer installed on the laptop he used to do this.
Parts list
TLC271CP
10K audio taper (15A) the board is laid out such that a pot should be able to be soldered into the holes, and the board essentially attached to the pot, OR, as I am going to do,
with wires, and glue it to the chassis somewhere.
.012 uf 5%
11.34K 1% 68.1 1% 6.34K 1% 34.8K 1%.
According to the whites schematics, typically there is a cap between the NE5534 and the input to the X phase detector. On can remove that cap, and wire the input to the side that was connected to the NE5534, and the output to the other side of the cap. There may be a resistor as well. This requires +7 V -7 V and ground. that is, the board sits between
the NE5534 reciever amp, and the next5 block in the chain. In the case of the 5900 di pro, it appears that there would be a 1K resistor R115 that cound be lifed on one end.
Not sure what my 4900 has, but I am pretty certain I'll be able to insert this into the signal path in the 4900, which is my goal. I don't know if sigbal is present on the normal daughter card for the 5900, I will eventually look, but if it isn't then I'm going to try inserting this into the circuit.
That combined with the 4900 sensitivity control ( a pot that controls current through the tx loop driver) I should have quite a capable detector.
I will probably hand built a couple of these for my own use, but if there is enough interest, I might be able to get some made at a board house somewhere.
enjoy.
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