Evaluation Board - KTP00477 | 23
14 : 5.Clip l limiter bypass
A clip limiter limits a max THD of output signal of about 3%. This limiter cannot be adjusted by the user. Threshold has been
intentionally set to a high THD value in order to get a maximum output power while having an acceptable distortion. Clip limiter
threshold drops when thermal limiter is engaged.
Thermal and voltage limiters can be enabled (ON status) or disabled by these switches. When the switches are enabled limiters
are not working but differently by the bypass function, signal pass through internal preamplifier stage anyway. The purpose of
this feature is a quick A/B comparison of amplifier with or without clip limiter active.
MUTE CH1
MUTE CH2
MUTE CH3
MUTE CH4
CH1
CH2
CH3
CH4
ON
MUTED
MUTED
ON
MUTED
MUTED
ON
MUTED
MUTED
ON
MUTED
MUTED
Couples of channels CH1-CH3 and CH2-CH4 can be muted or unmuted by acting on the switch “MUTE” of related channels.
When muting a channel, PWM generator stage is disabled.
14 : 6.Mute/Unmute
14 : 7.AUX Voltage selector
By default most of Powersoft modules provide an auxiliary supply voltage of +/-12V. By activating (ON status) this switch,
Minimod4 provide an auxiliary volt of +/-15V available on MiniMod4 only.
A LEDs light bar indicates 4 different thresholds as listed in the table below. Temperatures indicated on the scale must be
considered only as an indication and are strongly dependent from the module used along with evaluation board.
14 : 8.TempMon LED bar
LED
Turn on/off
Threshold (V)
25˚
2.5
50˚
1.65
75˚
0.93
85˚
0.826
When bypassing a channel of evaluation board, the signal goes directly from XLR input connectors to DIL 34 poles output
connectors. In this way, evaluation board can be transformed in a passive XLR input board, routing audio signals straight from
the input XLRs to the amplifier inputs (polarity reverse and bridge switches are disabled too).
The following position of switches “Bypass_0” “Bypass_01” “Bypass_2” “Bypass_3” “Bypass_4” should be set:
14 : 9.Bypass entire EVB
Channel to
be bypassed
BYPASS_0
BYPASS_1-4
1
2
3
4
5
6
7
8
1
2
3
4
CH1
OFF
OFF
-
-
-
-
-
-
ON
-
-
-
CH2
-
-
OFF
OFF
-
-
-
-
-
ON
-
-
CH3
-
-
-
-
OFF
OFF
-
-
-
-
ON
-
CH4
-
-
-
-
-
-
OFF
OFF
-
-
-
ON
Channel to
be activated
BYPASS_0
BYPASS_1-4
1
2
3
4
5
6
7
8
1
2
3
4
CH1
ON
ON
-
-
-
-
-
-
OFF
-
-
-
CH2
-
-
ON
ON
-
-
-
-
-
OFF
-
-
CH3
-
-
-
-
ON
ON
-
-
-
-
OFF
-
CH4
-
-
-
-
-
-
ON
ON
-
-
-
OFF
In order to activate the internal limiters of demo board, the above described switches must be set in the opposite position as follow.
When EVB bypass is active, the following features are still available: TEMP LED BAR, MUTE, energy save (+ energy save mode
selection).
