Hi,
I want to modify my CD-player Pioneer PD-S703 with a new clock. I fond the CD clock design by Ray (G.Tent and E. Kwak) on internet (see attached file) and decided to built one of this. In the attached files you can find my own PCB design and loyout. the problem is that I can't get it to work. I've tried it for several days on my PCB and on the breadboard but I can't get the right signal on my oscilloscope . Can you please take a look on this and help me. I run the test whit an external 12VDC power supply.
thank you!
I want to modify my CD-player Pioneer PD-S703 with a new clock. I fond the CD clock design by Ray (G.Tent and E. Kwak) on internet (see attached file) and decided to built one of this. In the attached files you can find my own PCB design and loyout. the problem is that I can't get it to work. I've tried it for several days on my PCB and on the breadboard but I can't get the right signal on my oscilloscope . Can you please take a look on this and help me. I run the test whit an external 12VDC power supply.
thank you!
Attachments
The crystal resonator is not connected to the positive potential of the circuit. Transistor J309 is closed. Try adding a 100k resistor or a 1000p capacitor from the gate to the +6V supply point. I hope there is a voltage of approximately +5.4V at the emitter of Q2.
This looks like one of the Kwak Clock versions. These are a Colpitts oscillator with a comparator afterwards to make a square wave. A brief check of the schematic looked okay, but I didn't look at the board layout. Is this an existing, proven schematic and board layout or is this something you've made yourself and are trialing for the first time?
Here's the first things I would check, all measured relative to circuit ground:
Here's the first things I would check, all measured relative to circuit ground:
- Are you seeing 8V on pin 3 of U2?
- Are you seeing about 5V on pin 3 of Q2?
- Are you seeing a sine wave at the junction of C7 and C8?
- What voltage is present on pin 3 of U1?