Gyrator loaded Son of ZV9/F3 | Page 2 | diyAudio
2015年6月14日 · Hi jvhb, I used an SMPS in previous version just because I had it handy and the voltage was suitable but I prefer a nice linear PSU, from reasons which I'll bring out if you open the separate thread about it. For the circuit in post #24 I use 10VA 2 x 18V~ transformer with secondaries connected in series which gives about +50V after rectification.
Gyrator loaded Son of ZV9/F3 | Page 3 | diyAudio
2015年6月14日 · jvhb, please measure and report the following voltages : 1. across the R2 (4R7) - should be about 50-60mV 2. across the R8 (47R) - should be about 500-600mV 3. between the source of Q6 (BS170) and the GND - should be about 27V 4. between the base of Q4 (bc547c or bc550c ) and the GND - should be about 13.5V 5. the Vgs of Q6 - should be about 2.3 V
Denon PMA-560 major overhaul - diyAudio
2021年6月28日 · After my Denon PMA-560 output relay tripping thread, diyaudio user Karl vd Berg asked for a scan of the service manual. I thought I'd do that and put it on a "PMA-560 fan site": Denon PMA-560 fan site :) Karl did a major overhaul of his PMA-560, which is documented here: Denon PMA-560...
Speaker Turn On Delay and DC Protector Board Set (V3)
2013年12月10日 · hi Jvhb i never ever use a resistor divider for constant voltage! - a 7812/7912 will do. yes i do not expect a hugh current so no power problems. yes start a new thread, i am happy without updates but your work will be interesting!
Radford MA50 problems and questions - diyAudio
2018年4月1日 · Hi, I am having some problems with a set of Radford RA-50 Renaissance mono amps, and I could use some help. Schematic is attached. They have now twice gone faulty with the same symptoms: C11 (Cathode to ground cap) exploded (literally), and fuse blown. The corresponding V4 tube actually...
Passively combining two audio channels | diyAudio
2018年5月1日 · jvhb. Member. Joined 2013. audioberg.dk/ 2018-05-07 12:08 pm #11 2018-05-07 12:08 pm #11 I am not an ...
Nelson Pass eXperimenter's Platform (NPXP) | Page 6 | diyAudio
2021年6月11日 · jvhb. Member. Joined 2013. audioberg.dk/ 2024-10-30 4:47 pm #112 2024-10-30 4:47 pm #112 Wasn't the point ...
Infinity kappa 9.2 I (series II) - diyAudio
2015年7月29日 · jvhb said: Hej Jens 🙂 You probably solved the problem by now, but here is the schematic just in case. The mid and upper ranges are pretty regular stuff, but those 2527uF for the woofers is quite something 😱
Nakamichi PA7II: HF noise-oscillation issue - diyAudio
2016年4月18日 · Hi, I have a problem with one channel in a Nakamichi PA-7II (220v european version), and I was hoping someone familar with these could chime in.. I tried to attach the service manual, but it is too large. The complete document can be found here: Nakamichi PA-7 Manual - Stereo Power Amplifier -...
Very simple quasi complimentary MOSFET amplifier
2014年4月28日 · Can we end this confusion. jvhb I assume has built with the 10R 1W resistors that conform to what is shown on the Rev 2.0 schematic shown below for R22 and R25. The boards that I have are Rev 2.01 shown below and show 10R 2W resistors for R22 and R23.