add NPN transistor to make mixer active

1 files changed, 63 insertions, 23 deletions

diff --git a/gschem/tuner.sch b/gschem/tuner.sch
index 6f151b6..a35b5fc 100644
--- a/gschem/tuner.sch
+++ b/gschem/tuner.sch
@@ -1,16 +1,16 @@
 v 20110115 2
-C 47500 43000 1 270 0 resistor-2.sym
+C 49800 42000 1 270 0 resistor-2.sym
 {
-T 47850 42600 5 10 0 0 270 0 1
+T 50150 41600 5 10 0 0 270 0 1
 device=RESISTOR
-T 47800 42500 5 10 1 1 0 0 1
+T 50100 41500 5 10 1 1 0 0 1
 refdes=R301
-T 47800 42300 5 10 1 1 0 0 1
+T 50100 41300 5 10 1 1 0 0 1
 value=100k
-T 47500 43000 5 10 0 1 0 0 1
+T 49800 42000 5 10 0 1 0 0 1
 footprint=R025
 }
-N 47600 43500 47600 43000 4
+N 49900 42500 49900 42000 4
 C 40900 44600 1 0 0 input-2.sym
 {
 T 40900 44300 5 10 1 0 0 0 1
@@ -21,8 +21,8 @@ T 41400 44700 5 10 1 1 0 7 1
 value=from melody preamp
 }
 N 42300 44700 42800 44700 4
-C 47300 41100 1 0 0 vcc-minus-1.sym
-N 47600 41700 47600 42100 4
+C 49600 40100 1 0 0 vcc-minus-1.sym
+N 49900 40700 49900 41100 4
 C 40900 43000 1 0 0 input-2.sym
 {
 T 40900 42700 5 10 1 0 0 0 1
@@ -33,7 +33,7 @@ T 41400 43100 5 10 1 1 0 7 1
 value=from bass preamp
 }
 N 42300 43100 42800 43100 4
-N 45600 43500 49100 43500 4
+N 48200 42500 51400 42500 4
 T 53500 37800 9 16 1 0 0 0 1
 Tuner output and melody effects insert
 C 44300 44600 1 0 0 resistor-2.sym
@@ -43,7 +43,7 @@ device=RESISTOR
 T 44900 45000 5 10 1 1 180 0 1
 refdes=R303
 T 44900 44500 5 10 1 1 180 0 1
-value=10k
+value=100k
 T 44300 44600 5 10 0 1 0 0 1
 footprint=R025
 }
@@ -55,15 +55,13 @@ device=RESISTOR
 T 44900 43400 5 10 1 1 180 0 1
 refdes=R304
 T 44900 42900 5 10 1 1 180 0 1
-value=10k
+value=100k
 T 44300 43000 5 10 0 1 0 0 1
 footprint=R025
 }
 N 44300 43100 43700 43100 4
 N 45600 43100 45600 44700 4
 N 45600 43100 45200 43100 4
-T 44100 43800 9 10 1 0 0 0 1
-passive mixer
 C 45400 48200 1 0 0 JFET_N-Channel-1.sym
 {
 T 45750 49000 5 10 1 1 0 6 1
@@ -205,19 +203,19 @@ value=MELODY RETURN
 }
 N 50900 48100 50900 46600 4
 N 50900 46600 52100 46600 4
-C 50800 43700 1 180 0 connector2-1.sym
+C 53100 42700 1 180 0 connector2-1.sym
 {
-T 50600 42700 5 10 0 0 180 0 1
+T 52900 41700 5 10 0 0 180 0 1
 device=CONNECTOR_2
-T 50800 42900 5 10 1 1 180 0 1
+T 53100 41900 5 10 1 1 180 0 1
 refdes=CONN301
-T 50800 43700 5 10 0 0 0 0 1
+T 53100 42700 5 10 0 0 0 0 1
 footprint=CONNECTOR 1 2
 }
-C 48300 41100 1 0 0 vcc-minus-1.sym
-N 48600 41700 48600 43200 4
-N 48600 43200 49100 43200 4
-T 49900 42500 9 10 1 0 0 0 1
+C 50600 40100 1 0 0 vcc-minus-1.sym
+N 50900 40700 50900 42200 4
+N 50900 42200 51400 42200 4
+T 52200 41500 9 10 1 0 0 0 1
 Tuner OUT (mono)
 C 50500 45300 1 90 0 connector2-1.sym
 {
@@ -233,7 +231,49 @@ T 49800 44700 9 10 1 0 0 0 3
 This connector is used
 because I only need two pins
 on the board.
-T 46800 44000 9 10 1 0 0 0 1
-TODO: add a bipolar transistor to make this an active mixer.
 C 44500 46400 1 0 0 gnd-1.sym
 N 44600 46700 44600 47100 4
+C 47700 43200 1 0 0 bc550.sym
+{
+T 48300 43700 5 10 0 0 0 0 1
+device=NPN_TRANSISTOR
+T 48300 43700 5 10 1 1 0 0 1
+refdes=Q301
+T 47700 43200 5 10 0 0 0 0 1
+footprint=TO92_CBE
+}
+C 48000 44500 1 0 0 vcc-2.sym
+N 48200 44500 48200 44200 4
+C 48100 42000 1 270 0 resistor-2.sym
+{
+T 48450 41600 5 10 0 0 270 0 1
+device=RESISTOR
+T 48400 41500 5 10 1 1 0 0 1
+refdes=R320
+T 48400 41300 5 10 1 1 0 0 1
+value=4k7
+T 48100 42000 5 10 0 1 0 0 1
+footprint=R025
+}
+N 48200 42000 48200 43200 4
+C 47900 40100 1 0 0 vcc-minus-1.sym
+N 48200 40700 48200 41100 4
+C 46700 42000 1 270 0 resistor-2.sym
+{
+T 47050 41600 5 10 0 0 270 0 1
+device=RESISTOR
+T 47000 41500 5 10 1 1 0 0 1
+refdes=R319
+T 47000 41300 5 10 1 1 0 0 1
+value=1M
+T 46700 42000 5 10 0 1 0 0 1
+footprint=R025
+}
+C 46700 40300 1 0 0 gnd-1.sym
+N 46800 40600 46800 41100 4
+N 46800 42000 46800 43700 4
+N 45600 43700 47700 43700 4
+T 42400 42000 9 10 1 0 0 0 1
+TODO: do we need a cap after the resistors?
+T 45000 50400 9 10 1 0 0 0 1
+TODO: replace JFET with bipolar NPN trannie