Audio Upgrades Muting Circuit Kits
_175.gif "Dual muting pcb")
_175.gif "Bare PCB")
This circuit has been designed to be used in almost any line level audio device offering custom muting options. Most cd players etc use transistor muting and these interfere with the audio signal when not in mute mode. Bypassing these can often induce unwelcome static or voltage discharge noises through your system as the unit powers up or down. This could damage your amp or speakers if the volume was set too high. The muting circuit eliminates this problem.
- PIC processor controlled
- 0.5 - 15 second selectable delay on start up
- Auto mute if supply voltage drops below 9V
- Auto mute if voltage rail sags
- Resets on stabilized voltage 9.2V – 15V (12V recommended)
- No delay on power down
- Gold plated PCB
- LED indication
- Supplied as DIY KIT (parts location guide supplied)
Kit Options-
Bare pcb and processor chip |
£14.00 |
|
| Dual PCB | £27.50 | |
| Dual PCB without Sockets | £26.00 | |
| Dual PCB without input Relay | £24.00 | |
| Single PCB | £23.50 | |
| Single PCB without Sockets | £22.50 |
The image shows the position to set the dip switches to for the correct muting delay time.
voltage regulators 
mains filters 
precision clocks 
output stage
