Member
Joined 2018
Hi farhad-San,
I guess you are using the UN-regulated power supply, so the supply voltage might be dropped at the big output swing.
Decreasing zener voltage will expand the tolerance of supply voltage drop (allowance level). On the other hand, this change will increases the risk of shut-off pop occurs.
Another possibility of the reason is Over-Current Protection which has an original feature of TPA3116D2 if you connect the very low impedance speaker loads...
Dear CyberPit; I use an unregulated linear power supply (12V rectified=almost 18V). When I disconnect the driver and go back to the original setup this severe on-off does not happen. It happens only at high volume when the driver is connected.
Member
Joined 2018
farhad-San,
If you feel too sensitive to detect the short term supply voltage drop, you can modify the circuit like this way...
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Dear CyberPit, Thank you so much for your suggestion. I will check the new circuit and report here.
Hi @CyberPit
It's been 5 years since your post but I want to thank you, it works perfectly.
I used a 1N4148 for S, a 3.3µF tantalum capacitor with 1M ohm was already fine but I obtained absolute perfection with 666K (2M in parallel with the 1M one).
With 19V of a notebook power supply absolutely no pop neither at power on nor at power off.
Fantastic, I completely eliminated the anti-pop, comparators and relays that I had used before.
Many thanks
It's been 5 years since your post but I want to thank you, it works perfectly.
I used a 1N4148 for S, a 3.3µF tantalum capacitor with 1M ohm was already fine but I obtained absolute perfection with 666K (2M in parallel with the 1M one).
With 19V of a notebook power supply absolutely no pop neither at power on nor at power off.
Fantastic, I completely eliminated the anti-pop, comparators and relays that I had used before.
Many thanks
Member
Joined 2018
has anyone tried this btl version?.....
TPA3116 Mono Channel Digital Power Audio Amplifier Board BTL Out 100W
Features:
Small size design, BTL output, the maximum output power 100w, can drive 2 ohm speakers, be balanced (differential) input, external heat sink chip work more stable.
Signal input mode can be selected according to the following two needs:
Balanced input signal (differential): Signal + Signal -, GND (ground).
Unbalanced inputs (single-ended): - end and GND (ground) short circuit, the signal input from the + terminal.
Imported Brands 3300 / 25V filter capacitor
Board size: 75mm * 50mm
Operating Voltage: DC 12v-24v
Maximum output power: 100w (2 ohm speakers connected)
TPA3116 Mono Channel Digital Power Audio Amplifier Board BTL Out 100W
Features:
Small size design, BTL output, the maximum output power 100w, can drive 2 ohm speakers, be balanced (differential) input, external heat sink chip work more stable.
Signal input mode can be selected according to the following two needs:
Balanced input signal (differential): Signal + Signal -, GND (ground).
Unbalanced inputs (single-ended): - end and GND (ground) short circuit, the signal input from the + terminal.
Imported Brands 3300 / 25V filter capacitor
Board size: 75mm * 50mm
Operating Voltage: DC 12v-24v
Maximum output power: 100w (2 ohm speakers connected)
Attachments
I saw it on Aliexpress, it is very small 75x50mm, sold at an incredible price of only €2.93 plus shipping. However I noticed that it does not have any preamp stage. I think it is necessary to add one, perhaps with tone controls.
Hi farhad. If you use a single 5,6V Zener (which is fine for 12V power supply) while using a 24V power supply, the startup delay will be very short and you will hear some pops. I solved the issue using a TL431 and a trimpot to replace the fixed zener with an "adjustable zener". By tuning the trimpot you can set the intervention threshold during for power off. A behavior similar to a 12.5V fixed Zener can be obtained when the part of the trimpot connected to VCC measures 160k and the other 40k. The picture shows my modification.
