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improved gain by ting R215 to base of bias pot. reduced oscillation with bigger r307/r308

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mirdejavel
2013-12-29 16:09:38 +00:00
parent fc0908e3e3
commit b80c7a4f70
2 changed files with 12 additions and 15 deletions
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eagle/sk109-scale-bias/sk109-scale-bias.brd
+5 -5
View File
@@ -598,11 +598,11 @@ design rules under a new name.</description>
<attribute name="NAME" x="74.6125" y="22.225" size="1.27" layer="25"/>
<attribute name="VALUE" x="78.4225" y="20.32" size="1.27" layer="27"/>
</element>
<element name="R307" library="rcl" package="R1206" value="22" x="61.2775" y="21.59" smashed="yes" rot="R180">
<element name="R307" library="rcl" package="R1206" value="220" x="61.2775" y="21.59" smashed="yes" rot="R180">
<attribute name="NAME" x="62.5475" y="20.32" size="1.27" layer="25" rot="R180"/>
<attribute name="VALUE" x="57.4675" y="20.955" size="1.27" layer="27"/>
</element>
<element name="R308" library="rcl" package="R1206" value="180" x="61.2775" y="23.8125" smashed="yes" rot="R180">
<element name="R308" library="rcl" package="R1206" value="1k8" x="61.2775" y="23.8125" smashed="yes" rot="R180">
<attribute name="NAME" x="62.5475" y="22.5425" size="1.27" layer="25" rot="R180"/>
<attribute name="VALUE" x="59.3725" y="24.13" size="1.27" layer="27" rot="R180"/>
</element>
@@ -949,7 +949,6 @@ design rules under a new name.</description>
<contactref element="C200" pad="1"/>
<contactref element="R301" pad="2"/>
<contactref element="R205" pad="2"/>
<contactref element="R215" pad="2"/>
<contactref element="C301" pad="2"/>
<contactref element="C300" pad="2"/>
<contactref element="C303" pad="-"/>
@@ -977,7 +976,6 @@ design rules under a new name.</description>
<wire x1="6.833" y1="26.67" x2="5.08" y2="26.67" width="0.4064" layer="1"/>
<wire x1="3.81" y1="18.8845" x2="3.658" y2="18.7325" width="0.4064" layer="1"/>
<wire x1="26.822" y1="16.1925" x2="26.822" y2="17.7665" width="0.4064" layer="1"/>
<wire x1="26.822" y1="17.7665" x2="27.153" y2="18.7325" width="0.4064" layer="1"/>
<wire x1="36.7" y1="20.6375" x2="36.7" y2="20.45" width="0.4064" layer="1"/>
<wire x1="36.7" y1="20.45" x2="38.1" y2="19.05" width="0.4064" layer="1"/>
<wire x1="38.1" y1="19.05" x2="38.1" y2="14.4175" width="0.4064" layer="1"/>
@@ -1044,7 +1042,6 @@ design rules under a new name.</description>
<via x="40.005" y="11.1125" extent="1-16" drill="0.8" diameter="1.2" shape="square"/>
<wire x1="40.005" y1="11.1125" x2="40.005" y2="12.5125" width="0.3048" layer="1"/>
<wire x1="40.005" y1="12.5125" x2="39.5" y2="13.0175" width="0.3048" layer="1"/>
<wire x1="27.153" y1="18.7325" x2="26.9875" y2="18.7325" width="0.3048" layer="1"/>
<wire x1="3.81" y1="18.8845" x2="3.81" y2="7.9375" width="0.4064" layer="1"/>
<wire x1="3.81" y1="7.9375" x2="21.9075" y2="7.9375" width="0.4064" layer="1"/>
<wire x1="21.9075" y1="7.9375" x2="24.13" y2="8.255" width="0.4064" layer="1"/>
@@ -1065,6 +1062,7 @@ design rules under a new name.</description>
<vertex x="81.5975" y="5.08"/>
<vertex x="1.5875" y="5.08"/>
</polygon>
<wire x1="26.822" y1="17.7665" x2="26.67" y2="18.415" width="0" layer="19" extent="1-1"/>
</signal>
<signal name="N$1">
<contactref element="C203" pad="2"/>
@@ -1082,6 +1080,8 @@ design rules under a new name.</description>
<contactref element="R208" pad="1"/>
<contactref element="GAIN-POT10K" pad="1"/>
<wire x1="33.4895" y1="35.8775" x2="35.9175" y2="35.8775" width="0.4064" layer="1"/>
<contactref element="R215" pad="2"/>
<wire x1="27.153" y1="18.7325" x2="33.4895" y2="35.8775" width="0" layer="19" extent="1-1"/>
</signal>
<signal name="N$3">
<contactref element="R209" pad="2"/>
eagle/sk109-scale-bias/sk109-scale-bias.sch
+7 -10
View File
@@ -11746,7 +11746,6 @@ body 3.9 mm/JEDEC MS-012AA</description>
<part name="R214" library="rcl" deviceset="R-EU_" device="R1206" value="1M"/>
<part name="R216" library="rcl" deviceset="R-EU_" device="R1206" value="1M"/>
<part name="R215" library="rcl" deviceset="R-EU_" device="R1206" value="1M"/>
<part name="GND6" library="supply1" deviceset="GND" device=""/>
<part name="C202" library="rcl" deviceset="C-EU" device="C1206" value="50p"/>
<part name="R218" library="rcl" deviceset="R-EU_" device="R1206" value="1k6"/>
<part name="P-1" library="supply1" deviceset="-5V" device=""/>
@@ -11763,9 +11762,9 @@ body 3.9 mm/JEDEC MS-012AA</description>
<part name="GND13" library="supply1" deviceset="GND" device=""/>
<part name="R306" library="rcl" deviceset="R-EU_" device="R1206" value="300"/>
<part name="GND14" library="supply1" deviceset="GND" device=""/>
<part name="R307" library="rcl" deviceset="R-EU_" device="R1206" value="22"/>
<part name="R307" library="rcl" deviceset="R-EU_" device="R1206" value="220"/>
<part name="GND15" library="supply1" deviceset="GND" device=""/>
<part name="R308" library="rcl" deviceset="R-EU_" device="R1206" value="180"/>
<part name="R308" library="rcl" deviceset="R-EU_" device="R1206" value="1k8"/>
<part name="R309" library="rcl" deviceset="R-EU_" device="R1206" value="75"/>
<part name="OUT-" library="wirepad" deviceset="3,17/1,1" device=""/>
<part name="X1" library="con-molex" deviceset="22-23-2031" device=""/>
@@ -11827,8 +11826,8 @@ body 3.9 mm/JEDEC MS-012AA</description>
<instance part="P-6" gate="1" x="-50.8" y="60.96"/>
<instance part="P+11" gate="1" x="-50.8" y="76.2"/>
<instance part="GAIN-IN" gate="1" x="-76.2" y="68.58"/>
<instance part="P-5" gate="1" x="-55.88" y="10.16"/>
<instance part="R208" gate="G$1" x="-55.88" y="17.78" rot="R270"/>
<instance part="P-5" gate="1" x="-55.88" y="2.54"/>
<instance part="R208" gate="G$1" x="-55.88" y="10.16" rot="R270"/>
<instance part="R209" gate="G$1" x="-55.88" y="38.1" rot="R270"/>
<instance part="IC2" gate="G$1" x="-25.4" y="66.04"/>
<instance part="IC2" gate="G$2" x="-17.78" y="25.4"/>
@@ -11862,7 +11861,6 @@ body 3.9 mm/JEDEC MS-012AA</description>
<instance part="R214" gate="G$1" x="-15.24" y="35.56"/>
<instance part="R216" gate="G$1" x="-10.16" y="20.32" rot="R90"/>
<instance part="R215" gate="G$1" x="-30.48" y="15.24" rot="R180"/>
<instance part="GND6" gate="1" x="-38.1" y="15.24" rot="R270"/>
<instance part="C202" gate="G$1" x="-5.08" y="20.32" rot="R180"/>
<instance part="R218" gate="G$1" x="10.16" y="25.4"/>
<instance part="P-1" gate="1" x="68.58" y="33.02"/>
@@ -12127,10 +12125,6 @@ body 3.9 mm/JEDEC MS-012AA</description>
<pinref part="GND4" gate="1" pin="GND"/>
</segment>
<segment>
<pinref part="R215" gate="G$1" pin="2"/>
<pinref part="GND6" gate="1" pin="GND"/>
</segment>
<segment>
<pinref part="C301" gate="G$1" pin="2"/>
<pinref part="GND9" gate="1" pin="GND"/>
</segment>
@@ -12212,6 +12206,9 @@ body 3.9 mm/JEDEC MS-012AA</description>
<segment>
<pinref part="R208" gate="G$1" pin="1"/>
<pinref part="GAIN-POT10K" gate="G$1" pin="S"/>
<wire x1="-55.88" y1="15.24" x2="-55.88" y2="22.86" width="0.1524" layer="91"/>
<pinref part="R215" gate="G$1" pin="2"/>
<wire x1="-35.56" y1="15.24" x2="-55.88" y2="15.24" width="0.1524" layer="91"/>
</segment>
</net>
<net name="N$3" class="0">