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Technical Tips from Mark W. Persons

Stanton C.500 Dual CD Player Modification

Stanton C.500 Professional Dual CD Players, apparently intended for the mobile DJ market, are showing up in radio stations across the country.  The unit comes in two parts that are connected via a DIN to DIN cable. 

Here is one that showed up in our shop for modification recently.  The 1/8-inch "1 and 2 Fader Start" jacks on the back are not radio station friendly.  Most of the stations, in this area, use ground-going-logic to start CD players from an audio console.  The Stanton remote input logic is not ground-going.

Fortunately, there is 5 VDC available in the control head and it is clearly marked.         

The photo shows the CD player control-head modified with two blue and white colored 5 VDC/DPDT relays.  Actually, each relay only needs to be single-pole normally-open, but the relays we use are the same price and easy to stock here. 

Across each relay coil is a 1N4007 diode to protect the switch and power supply from high-voltage reverse EMF when the remote control switch is opened.  Each relay is physically close to the front panel Play/Pause switch it is paralleled with.

Here is a close-up of one of the relays showing the short leads to the front panel circuit card.  All of the yellow wires are solid # 20 and were installed in our shop.  Four inductors need to be removed from the top end of the board so the original logic is no longer connected to the rear jacks.  The project takes about an hour.

The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons   ham W0MH      

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