Difference between revisions of "AudioAmp380"
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== Jacks == | == Jacks == | ||
− | + | === J1 - Audio In === | |
− | + | * 50 Ohms input impedance | |
− | + | * RCA | |
− | + | ||
− | + | == J2 - Audio Out == | |
− | + | * 8 Ohm speakers | |
+ | * RCA | ||
+ | |||
+ | == J3 - Power == | ||
+ | |||
+ | * 10V-22VDC | ||
+ | * 5.5mmx2.5mm DC jack | ||
== Rev 1 Schematic == | == Rev 1 Schematic == |
Revision as of 11:46, 27 March 2022
Contents
Design
- Pre-amp plus power amp
- 50 Ohm input impedance matches Product Detector outputs
- 0-10x Gain trimmer potentiometer on preamp
- External mount gain potentiometer
- NE5534 Pre-amplifier
- LM380 2.5W Audio Power Amplifier
- 12V nominal power
- 10-22V
- Fits into standard 80x50x20mm extruded aluminum enclosure
Pre-Amplifier (NE5534)
- Low-Noise Operational Amplifiers
- Equivalent Input Noise Voltage 3.5 nV/√Hz Typ
- Unity-Gain Bandwidth 10 MHz Typ
- Common-Mode Rejection Ratio 100 dB Typ
- Wide Supply-Voltage Range ±3 V to ±20 V
- Used as single supply
Audio Power Amplifier (LM380)
- Wide Supply Voltage Range: 10V-22V
- Low Quiescent Power Drain: 0.13W (VS= 18V)
- Voltage Gain Fixed at 50 (34 dB)
- High Peak Current Capability: 1.3A
- Input Referenced to GND
- High Input Impedance: 150kΩ
- Low Distortion
- Quiescent Output Voltage is at One-Half of the Supply Voltage
Controls
- RV1 - trade-off gain/bandwidth - Tune for best sound
- RV2 - volume control (after preamp and before LM380 Amp). 1x5 header wire to external pot
Jacks
J1 - Audio In
- 50 Ohms input impedance
- RCA
J2 - Audio Out
- 8 Ohm speakers
- RCA
J3 - Power
- 10V-22VDC
- 5.5mmx2.5mm DC jack
Rev 1 Schematic
- (Before rework)
LM380 Equivalent Schematic
Rev 2 Schematic
Rev 1 Rework
- Issues
- FPre-amp opamp has + and - reversed
- Also hooked up the feedback to the wrong input
- Replace R1 with wire jumper
- Replace C9 with wire jumper
- Remove C2
- 5 Cuts
- 4 on front
- 1 on back
- 5 jumper segments on back
- 2 nodes
- Jumpers on rear side
Videos