Do you mean a split rail supply +/- 5v ??I assume you are supplying +5V to pin 14, and -5V to pin 7 of the 4066
Can you suggest a value for R1/R2 pull down resistors ??You also need to pull the control lines of the the 4066 with pull down resistors to the pin 7
How do you do that ??, can you give me some idea ??You will need to AC couple the audio signals, and bias them at Vdd/2. Otherwise, you will have clipping. You will also need to AC couple the outputs.
Yes audio is at line level.I hope you are dealing with line-level audio (10k Ohm impedance)
I think there is a misscommunication here. If I understand you correctly you were using UDN2981A to drive relay coils, but you want to use 4066 to do the same job. It won't work as the the UDN's supply current to energize the relays. The 4066 will not supply enough current to energize relays.Hi
Do you mean a split rail supply +/- 5v ??
The supply i'am useing for the 4066's is +12v with 0v ground and the switch
control voltage is +12v from a UDN2981A, which is driven from a PIC16F628P
the UDN2981A was used to drive relays, but i want to use the 4066's instead!
Can you suggest a value for R1/R2 pull down resistors ??
Here is a updated circuit:
Your are right SgtWookie,I missread the schematic. My appologies.k7elp60,
I interpreted Howard's statement to be that he was using the UDN2981 to control the select lines of the 4066. A uC by itself couldn't swing the voltage high enough. Since the UDN2981 is a source array with open-collector outputs, a pull-down resistor was required to keep the select lines from floating when the UDN2981 outputs were off.
Basically, he's just sending RSSI and audio through the 4066. I think the modified schematic I put up should work OK, if he does a decent job on the trace routing.
If you see any mistakes or have suggestions for improvements, have at it.
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by Jake Hertz