Digital TM DIGI- LOG REVERB MODULE (BTDR- 2) Application Circuit A regulated 5V supply is mandatory. An LDO regulator is recommended for battery- powered devices. ■ The following example circuits are for instrument- level signals : - “Common” is “Signal GND” in a split-supply circuit or V /2 in a single-supply circuit. cc - Audio noise during power - down can be minimized by quickly discharging supply from 5V to 0V; otherwise, external output muting may be necessary. - R1, R2 and C1 create a pre- EQ high- pass filter and may be adjusted to taste. Stereo Circuit High- pass frequency (Hz) = 1/(π • C1 • R1) High frequency gain (dB) = 20 • log(2 • R2/R1) Mono Circuit High- pass frequency (Hz) = 1/(2π • C1 • R1) High frequency gain (dB) = 20 • log(R2/R1) Considerations for FCC Compliance The maximum internal clock frequency is approximately 14MHz. Although Accu- Bell believes that circuits employing solely the BTDR- 2 will easily pass FCC Part 15, no guarantees of compliance are made; the circuit must be tested as a whole for radiated and conducted emissions. 20 Engineering Co., LTD.
Digital TM DIGI- LOG REVERB MODULE (BTDR- 3) A great digital reverb sound that easily replaces a spring reverberation unit Features NEW ITEM Reverb depth (decay) adjustable via 2 external R E R A E V A resistors or 1 dual pot V N E N E A R A R L B L B O E O E G R G R Stereo outputs may be summed for mono operation A & A & T T D I D I O O I I G N G N I I T U T U A Simple interface: input, output, +5V, and ground N A N L I L T I T AC - coupled input and outputs require no external R capacitor O T A P R U Y S R H D O I T B G A I U T R Pat. No. : US 8,204,240 T A Y T L O C S N O W I S D T CN ZL200880021110.9 W E C I S H T W & C H I T C H & E O Specifications N P C T O I D C E A R L & S W M I E Parameter Symbol Minimum Typical Maximum Unit T C C H H . Supply Voltage VCC 4.5 5.0 5.5 V Supply Current ICC 60 100 mA Input Voltage V 1.5 V M IN PEAK I L I T Voltage Gain - 3 dB(each output) A R Y S Residual Noise -77 TBD dBV W I T C Input Impedance ZIN 10k Ω H Output Impedance ZOUT 220 Ω V Operating A - 40 +85 C C Temperature U T U U M B T Subject to change without notice E U S B H E I S E L O D C K E T & Ordering code (Only for BTDR-1 & 2) P O M W O E R B T D R - 3 - H - M D U E L N E T R D- Digital SERIES NO. MOUNT DECAY TIME Y 1 H- Horizontal S- Short BT- 2 V- Vertical M- Medium abbreviation 3 L- Long of BELTON J S A C R- Reverb O K C K & E X T L R 21 Engineering Co., LTD.