With a small Realistic tweeter replacing the failed bulb (that supplies a Positive Temp Coefficient resistance for amplitude stability normally), it still gives a very pure sine of 878Hz or so with a no 2nd order harmonic at 928mV pp, but a fraction off distortion and lost signal at +/-10.6V DC: Depending on voltage and ... Home Built Sine Gens Total Harmonic Distortion on DSO5102P
https://stevepedwards.today/electronicsarea.com/12v-auto-turn-off-battery-charger-with-current-limiter/
From the above, I built this: and turned my MCL gen into a 880Hz gen using a Realistic 8ohm tweeter in place of the bulb with the 0.1uF caps replaced: Cx must be ceramic for 8kHz + The above cannot work surely, as the gain is less than 3? 3k/1.8 < 3..
All there was, a blown power fuse! No remote control...board covered in dried cement dust - good clean, re-soldered an 800mA fuse and it came to life. CD tray is sticking, needs taking apart and cleaning. Unfortunately, CD LED is gone, won't read disks. Got an original AXD7707- Remote Control for -£10 from Ebay. Needs ... Pioneer X-HMII DAB System – Blown Ceramic Fuse
This amp has been the worst of all so far to find the lost channel issue - I traced the whole audio path first, checking components, damaging tracks and wasting time in a rabbit whole. Power/voltages come before a signal! All I had to do was check the voltages on the main board ribbon connector ... Sony EX50 – Multiplexor IC Causing Voltage Fault
Outputs not working - this was ONLY an intermittent ground connex fault of the front board metal shield!! - not a blown SVI amp as I thought I had done at full volume on the old SVI unit- it was OK!! Bought/fitted a replacement anyway, -£5 - the grey type...no need..doh... I blew my Sondberg ... Technics SU X840 – Replaced SVI 3102B
No Bass knob! That's it! Ebay "untested" not "spare repair" Found an Su840 knob replacement for balance, close enough. The power out is 53Vpp = 26.5Vp = 18.74V RMS = 351 / 8 ohms = 44W per channel into 8 ohms. This is with a massive 7Vp tuner input from the Carlson 1kHz Oscillator though, ... Su600 – No Bass Knob
Brushed boards clean with nail polish remover. Bought replacement bridge rectifier as was shorted so had mains 100V AC all over the power board...no fix. This has a shorted power board transformer secondary winding - hence no rectification and mains ac leakage. No individual transformer replacement available and a whole board is -£50 mark for ... Pioneer X-HM11 DAB-K – Dead, full of concrete dust.
The power out from 60Vpp is: 56.25W per channel into 8 ohm Hmm..no schematic? No phono input so no pre amp, so first amp is 8 pin JRC7004E - tests ok at pins 1 and 7 ouputs. STK4171V/STK4181V/STK4191V - ECG1317 Audio Power Amp, 50 W, 8 ohms, Vcc = +/- 35.5 V, 18 pin SIP. ... Sony Ex50 – no left channel output
https://www.instructables.com/id/Signal-Generator-AD9833/ //----------------------------------------------------------------------------- // Copyright 2018 Peter Balch // subject to the GNU General Public License //----------------------------------------------------------------------------- #include <math.h> //----------------------------------------------------------------------------- // Global Constants //----------------------------------------------------------------------------- const long BAUDRATE = 115200; // Baud rate of UART in bps //----------------------------------------------------------------------------- // Global Variables //----------------------------------------------------------------------------- const byte numberOfDigits = 6; // number of digits in the frequense byte freqSGLo[numberOfDigits] = ... Sweep Signal Generator AD9833 on Uno
Has 18V power but no FX sound, but signal passes to output. Duh! The mono out is clean sig only!! The stereo out is clean + FX! Not stereo FX..hence seemingly no FX when in mono out... This has 2 clock chips (MN3101/3007) for Bucket Brigade Devices. MN3101.pdf tl022.pdf ua741.pdf Not the right circuit, but ... Sean’s Ibanez Chorus
Bad connections/short to power line. LED dis. Seems ok now. Need a sweep gen to check properly on bench...Seems to filter up to 5kHz max? Shit sound - the Autowah3 is much better. MC14007UB-D.pdf LM13600.pdf lm1458.pdf
One of the nicest looking 1983 amps in silver and black eh? Liked to have kept this... Nothing wrong really, bit noisy - caps etc. Subsonic buttons makes loud pop - cleaned pots/switches etc. Has a micro controlled preheat function: 54Vpp = 27Vp =- 19V RMS P = V^2/ R = 19 x 19 / ... Technics SU V303 + THD
70W monster (235W used). Nothing actually wrong, dirty inputs? Sean plugging amp vol out into phono no doubt... 22,000uF Caps!! Some odd small signals on the RIAA outs compared to 3+ bigger amp in, but still works on all inputs. +/-50V DC rails Power out x10 probes = 70Vpp. RMS = 24.748737342 612.5- / 8 ... Sean’s SU A808
Pin 7 (-5V) needs to be connected also!!
Lost track of definitive faults (lost channel, low volume) fixes - it's had the 3120A power amp from the 84o installed, the M5219 tone/buffer amps replaced by LM328s and after removal of AN6554 phase amp and damaging tracks, I managed to install a 7 pin chip holder here, then got full signal in/out all 4 ... Technics SUX911 – Fixed, Power Out
You can test quad packages quickly setting it up for the high input Z/low outZ 1:1 amp - 2 corners with a 1K-100k pull up for gdn ref pin 3+, 100% feedback (pins 1-2 linked), input pin 3; then alternate the +-15V power lines when you turn it upside down, sine wave in = sine ... LM324/AN6554 Quad Amp IC Quick Test 100% Feedback Op Amp Circuit
D880 NPN/6033 PNP power amps unmatched pair (gains 154/166)- symmetrical within 1Vp. Vpp out at 13.6V dual rail = 6Vp power into 8 ohm load- = 6x6/8 = 4.5W mono. Now working in stereo after the most unreal happenings of Mhz noise and weird connections! 2 days of shit as usual! Just swapping same components ... LM358/6552/6558 based mono NPN/PNP class B amp
Page xx of book - can't sort a volume control position for this setup. Only have the voltage to raise to +/-17.6V to get clean signal. Generates about 15Vpp output from the NPN/PNP power pair. Understand Op Amps:
These are used in the Su x911 for phase effects surround sound etc. I had LOADS of shit NOT getting these to amplify as an amp before doing this circuit - I can only assume bad board connections as the same IC oscillates fine for this! Another wasted day... Taken from this first output for ... LM324/AN6554 14pin quad amp tester
These ARE vacuum tubes! They have a grid, anode and cathode same as a tube. See error in assuming getter was blown bulb in prior Technics 840? post!! Goon..They can't be used as amps though... The pins can usually be traced from the back. The pins between the dots are the grid and the dots ... Vacuum Flouro Displays
Testing a Mostek z80 CPU found in a Walker Sat Nav 801. 3880.pdf Max clock = 2.5MHz 3 the same Z80PIO chips - can't check these now. 1 x z80 MK3880N-41RL -- binary counting the same as the circuit above, but you need a min of 4 LEDs to start this and can go to ... Z80 CPU Tester – Julian Illet
Bad Link Cable Connections - soldered them direct to valve PCB pins - and Missing Tube Heater link cable. Probe slip arc'd heater feed caps - blew mains LED cct. Used valve LED. Lost speaker output. MP3 and 1 channel for guitar in works via phones. Tube heaters now working so have pre amp: Some ... Indie IT 150 Guitar Amp
lm358n 5 gain cct: 30V DC (max V = < 33V!), gain of 5 circuit Rf = 100k (pins 2 to 1); Rin (pin2),2Vpp sine input , inverting)= 20k; voltage divider 2 x 10k for 15V at pin3 (non inverting); clipping starts at 27.5Vpp for a 5.4Vpp input. This circuit swings quite close to within ... LM358N/TL082/741 Op Amps 5 Gain Circuits and 741 Op Amp Tester Circuit
Many devices (0-127) can use the 2 pin I2C bus (OLED, NEO7GPS, BMP180), but you have to connect them in parallel to pins SCL-A4 and SDA-A5 of a Nano so they share the bus. (SDA and SCL are marked on an Uno). The Wire.h library is required as an #include. They need to be able ... I2C Bus Connections For 2 Or More Devices
This code adds DHT data and removes the serialmon data to thin the code. Also showing the only next text size up from size 1-2 in the OLED. /****************************************************************************** Steve_GPS_OLED.ino to display GPS and DHT11 data in OLED, adapted from: TinyGPSPlus_GPS_Shield.ino TinyGPS++ Library Example for the SparkFun GPS Logger Shield By Jim Lindblom @ SparkFun ... Showing GPS and DHT11 Temp/Humidity in 128×32 OLED with 2 Text Sizes
https://stevepedwards.today/KKmoon 1HZ-500KHZ DDS Functional Signal Generator Sine + Square + Triangle + Sawtooth Waveform
https://stevepedwards.today/KKmoon 1HZ-500KHZ DDS Functional Signal Generator Sine + Square + Triangle + Sawtooth Waveform
Lysignal Fever 6J1 Tube Amplifiers Board Preamplifier Headphone Pre-Amp Amplifier Audio Board DIY Kits -£14.69 Specifications: *Models: 6J1 tube *Channel types: 2.0 / stereo *Working voltage: AC12V 0.8 A *The power interface: 5.5 * 2.5 plug *Circuit board size: 77 x 75 x 52 mm *Potentiometer role: volume adjustment + power switch. Package Included : ... Lysignal Fever 6J1 Tube Amplifiers Board