The Stereo VU Meter PC board with the components fitted. Only the battery and speaker are external, connected to flying leads. A close up of the completed unit. The overlay makes construction easy. Make sure the left-hand row of resistors starts with 47k at the bottom and 4k7 at the top. I saw one unit with the whole row reversed. It made very little difference to the performance of the unit, but it was not quite as sensitive as the correct version
HIGH-VOLTAGE, HIGH-CURRENT DARLINGTON ARRAYS
deally suited for interfacing between low-level logic circuitry and multiple peripheral power loads,
the Series ULN20xxA/L high-voltage, high-current Darlington arrays feature continuous load current ratings to 500 mA for each of the seven drivers.
At an appropriate duty cycle depending on ambient temperature and number of drivers turned ON simultaneously,
typical power loads totaling over 230 W (350 mA x 7, 95 V) can be controlled. Typical loads include relays, solenoids, stepping motors,
magnetic print hammers, multiplexed LED and incandescent displays, and heaters.
All devices feature open-collector outputs with integral clamp diodes.
These devices will handle numerous interface needs — particularly those beyond the capabilities of standard logic buffers.
The ULN2004A/L and ULN2024A/L have series input resistors for operation directly from 6 to 15 V CMOS or PMOS logic outputs.
The ULN2003A/L and ULN2004A/L are the standard Darlington arrays.
The outputs are capable of sinking 500 mA and will withstand at least 50 V in the OFF state.
Outputs may be paralleled for higher load current capability. The ULN2023A/L and ULN2024A/L will withstand 95 V in the OFF state.
These Darlington arrays are furnished in 16-pin dual in-line plastic packages (suffix “A”) and 16-lead surface-mountable SOICs (suffix “L”).
All devices are pinned with outputs opposite inputs to facilitate ease of circuit board layout.
All devices are rated for operation over the temperature range of -20°C to +85°C. Most (see matrix, next page) are also available for operation to -40°C; to order, change the prefix from “ULN” to “ULQ”. FEATURES ■ TTL, DTL, PMOS, or CMOS-Compatible Inputs ■ Output Current to 500 mA ■ Output Voltage to 95 V
■ Transient-Protected Outputs
■ Dual In-Line Plastic Package or Small-Outline IC Package
TDA2030 14 W hi-fi audio amplifier Features
■ Wide-range supply voltage, up to 36 V
■ Single or split power supply
■ Short-circuit protection to ground
■ Thermal shutdown Description The TDA2030 is a monolithic integrated circuit in the Pentawatt® package
, intended for use as a low frequency class-AB amplifier.
Typically it provides 14 W output power (d = 0.5%) at 14 V/4 Ω. At ±14 V or 28 V,
the guaranteed output power is 12 W on a 4 Ω load and 8 W on an 8 Ω (DIN45500).
The TDA2030 provides high output current and has very low harmonic and crossover distortion. Furthermore, the device incorporates an original (and patented) short-circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the operating point of the output transistors within their safe operating range. A conventional thermal shutdown system is also included
Electrical specifications
TDA2030 4/17 Doc ID 1458 Rev 3 d Distortion Po = 0.1 to 12 W,
RL = 4 Ω, GV = 30 dB f = 40 to 15.000 Hz 0.2 0.5 % Po = 0.1 to 8 W,
RL = 8 Ω, GV = 30 dB f = 40 to 15.000 Hz 0.1 0.5 % B Frequency response (–3 dB) Po = 12 W,
RL = 4 Ω; GV = 30 dB 10 Hz to 140 Hz Ri Input resistance (pin 1) 0.5 5 MΩ Gv Voltage gain (open loop) 90 dB Gv Voltage gain (closed loop) f = 1 kHz 29.5 30 30.5 dB eN Input noise voltage B = 22 Hz to 22 kHz 3 10 µV i N Input noise current 80 200 pA SVR Supply voltage rejection GV = 30 dB; RL = 4 Ω, Rg = 22 kΩ, fripple = 100 Hz; Vripple = 0.5 Veff 40 50 dB I d Drain current Po = 14 W, RL = 4 Ω Po = 9 W, RL = 8 Ω 900 500 mA Tj Thermal shutdown junction temperature 145 °C
