220Vac Line / 220 Vac Socket :
This is our household power, it is 220Vac / 60 Hz in the Philippines, 220Vac / 50Hz in China and 110Vac / 60Hz in the USA. It is available in our home AC socket.
AC Power Controller :
This is a relay that can handle 10 Ampere (10Amp) of current, we used the relay to open (break) and close (make) the 220Vac line so we can implement ECO mode deep-sleep when it is not being used, it is like you switch off the power amplifier with a switch. But using a relay is much better so we can control it with a Micro Controller in a different way, like (a) manual (b) remote control (c) mobile application (APP).
The Transformer (Xformer) is Megatron or Bumblebee, this is a device that will convert the 220Vac high voltage from the household power into a lower voltage suitable into our Amplifier, like 36Vac or 20Vac. In the normal way, the transformer rating can be as follows :
- Primary : 220Vac / 60 Hz
- Secondary : 36 – 0 – 36
- Wattage : 300 Watts
- Type : Torroid core or EI core Type
Rectifier & Filter :
The Rectifier will transform the Secondary AC voltage of 36Vac into a pulsating DC voltage, normally the rectifier used in Power Amplifier is a bridge diode. The large value capacitor like 4,700uF/50V or 10,000/50V is used as filter capacitors to smooth out the pulsating voltage from the rectifier. A pair of 0.1uF/50V is used to filter high-frequency component of the filtered DC signal. The resulting of this block is a good DC voltage, but it is not a regulated voltage.
Power Amplifier :
The power amplifier with the heatsink is the major block of our project, where we monitor the DC offset voltage, not to output voltage of more than +/-1.0Vdc. We also use FAN to cool down the heatsink. The amplifier must conform to the output voltage of the rectifier + filter board. If you amplifier supply is +/-30Vdc, you must use an AC input of 36-0-36Vac, this is about +/-50Vdc.
Speaker Protector Relay :
This is a relay that will connect (make) or disconnect (break) the speaker from the output stage of the amplifier. There are 2 reasons why we need to do this :
- Kill Noise during the power on/off stage
- Protect the speaker from dangerous offset voltage
- Protect the speaker if the amplifier gt crazy / damage
- Remove the fuse in series with the speaker.
Smart Amplifier Manager – SAMuC
This is an add-on module or device that manages the :
- AC Power Controller
- Speaker Protection
- Fan Control
- Remote control / Home Automation / IoT
It runs by a Micro Controller based on the Intel 8051 high-speed MCU, and driven by 1diyTeam propriety program. Don’t be shock !
SAMuC is driven by a firmware wrote by me (us), and you can learn to do that by yourself in a DIY way if you have the guts and determination to learn. We are putting our effort to make DIY hobby as fun as possible with new learning and a new ingredient.
I will soon be enabling the link, visit :