Hey all I am wanting another set of eyes to review my schematic to make sure I have everything connected correctly. It looks like its connected correctly to me but another set of eyes on it is always a good thing!
I'm also wanting to find better substitutes for the C1 470uf and C2 1uf caps. Are there any that I can get that are smaller (height wise)? I'm looking to have the smallest height possible.
Note that I did my own thing for the power conversion and the RGB.
Here is what I used to go by while creating the schematic:
I'm also wanting to find better substitutes for the C1 470uf and C2 1uf caps. Are there any that I can get that are smaller (height wise)? I'm looking to have the smallest height possible.
Note that I did my own thing for the power conversion and the RGB.
Here is what I used to go by while creating the schematic:
Rich (BB code):
1. Bidirectional Level Shifter (3.3V ↔ 5V) - VERIFIED BIDIRECTIONAL LEVEL SHIFTER
Valentine One Side (5V) ESP32-C3 Side (3.3V)
───────────────────────── ─────────────────────────
+5V +3.3V
│ │
╔══╗ ╔══╗
║R1║ 10kΩ ║R3║ 10kΩ
╚══╝ ╚══╝
│ │
├─────────── To V1 DATA ├─────────── To GPIO21/TX
│ (RJ11 Pin 2) │ To GPIO20/RX
│ │
Drain Drain
│ │
┌───┴───┐ ┌───┴───┐
│ │ │ │
│ Q1 │ │ Q2 │
│BSS138 │ │BSS138 │
│ │ │ │
└───┬───┘ └───┬───┘
Gate Gate
│ │
└─────────────────┬─────────────────────────┘
│
│ +3.3V
│ │
│ ╔══╗
│ ║R2║ 10kΩ
│ ╚══╝
│ │
└──┤ (Gates connected together)
│
Source│Source
│ │
┴ ┴
GND GND
IMPORTANT: Both MOSFET Sources MUST connect to GND
Step-by-Step Connection Guide for Level Shifter:
Install Q1 (BSS138 or 2N7000):
================================
Source (Pin 1) → Connect to GND
Gate (Pin 2) → Leave for now (will connect in step 5)
Drain (Pin 3) → Connect to V1 DATA line
Install Q2 (BSS138 or 2N7000):
================================
Source (Pin 1) → Connect to GND
Gate (Pin 2) → Leave for now (will connect in step 5)
Drain (Pin 3) → Connect to ESP32 GPIO21 and GPIO20
Install R1 (10kΩ pull-up):
================================
One end → +5V supply
Other end → Q1 Drain (same point as V1 DATA)
Install R3 (10kΩ pull-up):
================================
One end → +3.3V supply
Other end → Q2 Drain (same point as GPIO20/21)
Connect Gates Together with R2:
================================
Connect Q1 Gate to Q2 Gate with a wire
Install R2 (10kΩ): One end to +3.3V, other end to the connected gates
Verify Connections:
================================
Both Sources are at GND
Gates are connected together and pulled to 3.3V
Each Drain has its respective pull-up
2. Legacy Mode 1.4V Pull-up Generator - VERIFIED LEGACY MODE 1.4V GENERATOR
Control Stage Voltage Generation Stage
────────────── ─────────────────────────
GPIO6 ──┐
│
╔══╗
║R5║ 1kΩ +3.3V +3.3V
╚══╝ │ │
│ ╔══╗ ╔══╗
Gate ║R6║ ║R7║
│ ║10kΩ ║10kΩ
┌───┴───┐ ╚══╝ ╚══╝
│ │ │ │
│ Q3 │Drain └────┬────────┘
│BSS138 ├──────────────────────Base
│ │ │
└───┬───┘ ┌───┴───┐
Source │ │Collector
│ │ Q5 ├────────── To V1 DATA
┴ │MMBT │ (1.4V output)
GND │2222A │
│ │
└───┬───┘
Emitter
│
╔══╗
║R8║ 4.7kΩ
╚══╝
│
┴
GND
Step-by-Step Connection Guide for Legacy Pull-up:
================================
Install Q3 (BSS138 Control MOSFET):
Source → GND
Gate → Through R5 (1kΩ) to GPIO6
Drain → Will connect to Q5 base circuit
Install Voltage Divider (R6 and R7):
================================
R6 (10kΩ): One end to +3.3V
R7 (10kΩ): One end to +3.3V
Connect other ends of R6 and R7 together (creates ~2.1V when active)
Install Q5 (MMBT2222A or 2N2222):
================================
Base → Connect to junction of R6/R7 AND Q3 Drain
Emitter → Through R8 (4.7kΩ) to GND
Collector → Connect to V1 DATA line
Install R5 (1kΩ gate resistor):
================================
One end → GPIO6
Other end → Q3 Gate
Install R8 (4.7kΩ emitter resistor):
================================
One end → Q5 Emitter
Other end → GND
Operation Verification:
================================
GPIO6 LOW: No pull-up on DATA line
GPIO6 HIGH: ~1.4V appears on DATA line
3. MUTE Control Circuit - VERIFIED MUTE CONTROL CIRCUIT
Control Input Output Stage
────────────── ──────────────
V1 MUTE Pin 5
│
╔═══╗
║R10║ 10kΩ (Internal V1 pull-up)
╚═══╝
│
GPIO5 ──┐ ├────── To V1 Pin 5 (MUTE)
│ │
╔══╗ Drain
║R9║ 10kΩ │
╚══╝ ┌───┴───┐
│ │ │
Gate │ Q4 │
│ │BSS138 │
┌───┴───┐ │ │
│ NC │ └───┬───┘
│ │ Source
└───────┘ │
(R9 protects gate) ┴
GND
Note: V1 has internal pull-up, R10 shown for reference
Step-by-Step Connection Guide for MUTE Control:
Install Q4 (BSS138 MUTE Control):
================================
Source → GND
Gate → Through R9 to GPIO5
Drain → Direct to V1 MUTE (Pin 5 of RJ11)
Install R9 (10kΩ protection resistor):
================================
One end → GPIO5
Other end → Q4 Gate
Note about R10:
================================
R10 is INTERNAL to V1, do NOT add external pull-up
V1 maintains MUTE line at +5V when idle
Operation:
================================
GPIO5 LOW: MUTE line stays at +5V (no mute)
GPIO5 HIGH: Q4 pulls MUTE to GND (activates mute)
4. Power and Ground Connections - VERIFIED POWER DISTRIBUTION
From Valentine One ESP32-C3 Power
────────────────── ────────────────
RJ11 Pin 4 (+12V) ──┐ USB 5V ──┐
│ │
[UNUSED] [Internal LDO]
│ │
│ +3.3V
RJ11 Pin 3 (GND) ───┬───────────────────────┤
│ │
┴ ┴
COMMON GND COMMON GND
CRITICAL: V1 GND and ESP32 GND MUST be connected together
Step-by-Step Connection Guide for Power:
Connect Grounds:
================================
V1 Pin 3 (GND) → ESP32 GND
This is CRITICAL for proper operation
V1 Power (Pin 4):
================================
NOT USED for powering ESP32
Leave disconnected or add protection diode only
ESP32 Power:
================================
Power via USB (5V)
ESP32 generates its own 3.3V
Add Bypass Capacitors:
================================
100nF ceramic near ESP32 3.3V pin
10µF electrolytic on 3.3V rail
5. Complete Pin Connection Summary RJ11 CONNECTOR (Looking into jack)
┌──────────────────────────┐
│ 6 5 4 3 2 1 │
└──────────────────────────┘
NC MUTE +12V GND DATA NC
CONNECTIONS:
Pin 1: Not Connected
Pin 2: DATA → Level Shifter Q1 Drain AND Legacy Gen Q5 Collector
Pin 3: GND → Common Ground for entire circuit
Pin 4: +12V → Not used (ESP powered via USB)
Pin 5: MUTE → Q4 Drain (MUTE control)
Pin 6: Not Connected
ESP32-C3 CONNECTIONS:
GPIO20: RX → Level Shifter Q2 Drain
GPIO21: TX → Level Shifter Q2 Drain (same connection)
GPIO5: → R9 → Q4 Gate (MUTE control)
GPIO6: → R5 → Q3 Gate (Legacy control)
GPIO8: → R11 (220Ω) → LED → GND
GND: → Common ground
3.3V: → Pull-ups and bias resistors
Critical Design Verification Points
✅ Level Shifter Checklist:
================================
Both MOSFET sources connected to GND
Gates connected together with 3.3V pull-up
5V pull-up on V1 side drain
3.3V pull-up on ESP32 side drain
No direct 5V to 3.3V connection
✅ Legacy Generator Checklist:
================================
Q5 collector to DATA line (provides 1.4V)
Q5 emitter through 4.7kΩ to GND
Voltage divider creates ~2.1V at base
Q3 controls activation
✅ MUTE Control Checklist:
================================
Q4 drain to MUTE pin
Q4 source to GND
NO external pull-up (V1 has internal)
Gate protection resistor installed
✅ Power Checklist:
================================
Common ground between V1 and ESP32
ESP32 powered via USB only
12V from V1 NOT connected to ESP32
Bypass capacitors installed
All critical connections and control logic check out based on your notes. For C1 (470µF) and C2 (1µF), try low-profile polymer or tantalum caps they’re shorter and more compact.
